Date: Mon, 20 Mar 2017 10:25:22 +0000 From: "Agostino Sarubbo" <ago@...too.org> To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com> Subject: libpcre: NULL pointer dereference in main (pcretest.c) Description: libpcre is a perl-compatible regular expression library. A fuzz on libpcre1 through the pcretest utility revealed a null pointer dereference in the utility itself. For the nature of the crash, it is not security relevant because the library is not affected but if you have a web application that calls directly the pcretest utility to parse untrusted data, then you are affected. Also, it is important share the details because some distros/packagers may want to take the patch in their repository. The complete ASan output: # pcretest -16 -d $FILE ==26399==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000052db1c bp 0x7ffc7de68070 sp 0x7ffc7de67ba0 T0) ==26399==The signal is caused by a READ memory access. ==26399==Hint: address points to the zero page. #0 0x52db1b in main /tmp/portage/dev-libs/libpcre-8.40/work/pcre-8.40/pcretest.c:5083:25 #1 0x7f70603bc78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289 #2 0x41b438 in _init (/usr/bin/pcretest+0x41b438) Affected version: 8.40 Fixed version: 8.41 (not released atm) Commit fix: https://vcs.pcre.org/pcre/code/trunk/pcretest.c?r1=1685&r2=1686&sortby=date Credit: This bug was discovered by Agostino Sarubbo of Gentoo. CVE: N/A Reproducer: https://github.com/asarubbo/poc/blob/master/00195-pcre-nullptr-main Timeline: 2017-02-22: bug discovered and reported to upstream 2017-02-23: upstream released a patch 2017-03-14: blog post about the issue Note: This bug was found with American Fuzzy Lop. Permalink: https://blogs.gentoo.org/ago/2017/03/14/libpcre-null-pointer-dereference-in-main-pcretest-c -- Agostino Sarubbo Gentoo Linux Developer
Powered by blists - more mailing lists
Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.