bugtraq - PCRE compile workspace overflow

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date: Wed, 5 May 2010 15:12:26 -0400
From: Michael Santos <michael.santos@...il.com>
To: bugtraq@...urityfocus.com
Subject: PCRE compile workspace overflow

In versions of the PCRE regular expression library before 8.02, compiling
a very large regular expression will overflow the workspace buffer.

Although the code checks for the size of the compiled regular expression,
the check only returns true after the end of the buffer has been
overrun. The bug was fixed in PCRE 8.02 with this patch:

    http://vcs.pcre.org/viewvc/code/trunk/pcre_compile.c?r1=504&r2=505&view=patch

This example will cause a 2 byte overflow:

~$ perl -e 'print "/","("x819, ")"x819, "/"' | pcretest

Original Bug Report:

    http://bugs.exim.org/show_bug.cgi?id=962