Full_Name: Stef Walter Version: openldap 2.4.10 OS: FreeBSD 6.3-RELEASE-p2 URL: http://memberwebs.com/stef/scraps/openldap24-buffer-overflow.patch Submission from: (NULL) (189.162.38.105)

The back_sock and back_shell backends have a buffer overflow (off by one) problem in their result parsing code in read_and_send_results() lines 82-89 in result.c. The buffer is reallocated when an additional string would be too long for the buffer, but the string's null terminator is not taken into account.

This can cause a crash in certain situations. These situations are obviously data and OS dependent. But with specific data, the crash is reproducible.

Patch which fixes the problem:

--- ../openldap-2.4.10/servers/slapd/back-sock/result.c 2008-02-08 18:46:09.000000000 -0000 +++ servers/slapd/back-sock/result.c 2008-06-13 15:56:46.000000000 -0000 @@ -77,7 +77,7 @@ }

len = strlen( line ); - while ( bp + len - buf > bsize ) { + while ( bp + (len + 1) - buf > bsize ) { size_t offset = bp - buf; bsize += BUFSIZ; buf = (char *) ch_realloc( buf, bsize ); --- ../openldap-2.4.10/servers/slapd/back-shell/result.c 2008-02-11 17:26:47.000000000 -0000 +++ servers/slapd/back-shell/result.c 2008-06-13 15:57:02.000000000 -0000 @@ -80,7 +80,7 @@ }

len = strlen( line ); - while ( bp + len - buf > bsize ) { + while ( bp + (len + 1) - buf > bsize ) { size_t offset = bp - buf; bsize += BUFSIZ; buf = (char *) ch_realloc( buf, bsize );