Date: Thu, 09 Feb 2017 14:49:10 +0100 From: Agostino Sarubbo <ago@...too.org> To: oss-security@...ts.openwall.com Subject: zziplib: NULL pointer dereference in main (unzzipcat.c) Description: zziplib is an intentionally lightweight library that offers the ability to easily extract data from files archived in a single zip file. A fuzz on it discovered an a NULL pointer access. The complete ASan output: # unzzipcat $FILE ==22686==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0x7f6de98b259a bp 0x7ffddc25a080 sp 0x7ffddc259f98 T0) ==22686==The signal is caused by a READ memory access. ==22686==Hint: address points to the zero page. #0 0x7f6de98b2599 in strlen /var/tmp/portage/sys-libs/glibc-2.22- r4/work/glibc-2.22/string/../sysdeps/x86_64/strlen.S:76 #1 0x7f6de989b7ab in _IO_puts /var/tmp/portage/sys-libs/glibc-2.22- r4/work/glibc-2.22/libio/ioputs.c:36 #2 0x509d73 in main /tmp/portage/dev-libs/zziplib-0.13.62- r1/work/zziplib-0.13.62/bins/unzzipcat.c:94:6 #3 0x7f6de985161f in __libc_start_main /var/tmp/portage/sys- libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289 #4 0x419848 in _init (/usr/bin/unzzipcat+0x419848) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /var/tmp/portage/sys-libs/glibc-2.22- r4/work/glibc-2.22/string/../sysdeps/x86_64/strlen.S:76 in strlen ==22686==ABORTING Affected version: 0.13.62 Fixed version: N/A Commit fix: N/A Credit: This bug was discovered by Agostino Sarubbo of Gentoo. CVE: N/A Reproducer: https://github.com/asarubbo/poc/blob/master/00158-zziplib-nullptr-main Timeline: 2017-01-17: bug discovered and poked upstream 2017-02-09: blog post about the issue Note: This bug was found with American Fuzzy Lop. Permalink: https://blogs.gentoo.org/ago/2017/02/09/zziplib-null-pointer-dereference-in-main-unzzipcat-c -- Agostino Sarubbo Gentoo Linux Developer
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