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zziplib: invalid memory read in zzip_mem_entry_extra_block (memdisk.c)
From: Agostino Sarubbo <ago () gentoo org>
Date: Thu, 09 Feb 2017 14:44:44 +0100
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 invalid memory read. The complete ASan output: # unzzipcat-mem $FILE ==7950==ERROR: AddressSanitizer: SEGV on unknown address 0x603000014e32 (pc 0x7f414b4c8693 bp 0x7fff48f3ff70 sp 0x7fff48f3fe40 T0) ==7950==The signal is caused by a READ memory access. #0 0x7f414b4c8692 in zzip_mem_entry_extra_block /tmp/portage/dev- libs/zziplib-0.13.62-r1/work/zziplib-0.13.62/zzip/memdisk.c:248:20 #1 0x7f414b4c8692 in zzip_mem_entry_new /tmp/portage/dev- libs/zziplib-0.13.62-r1/work/zziplib-0.13.62/zzip/memdisk.c:218 #2 0x7f414b4c8692 in zzip_mem_disk_load /tmp/portage/dev- libs/zziplib-0.13.62-r1/work/zziplib-0.13.62/zzip/memdisk.c:137 #3 0x7f414b4c78b7 in zzip_mem_disk_open /tmp/portage/dev- libs/zziplib-0.13.62-r1/work/zziplib-0.13.62/zzip/memdisk.c:89:5 #4 0x50982d in main /tmp/portage/dev-libs/zziplib-0.13.62- r1/work/zziplib-0.13.62/bins/unzzipcat-mem.c:82:12 #5 0x7f414a60761f in __libc_start_main /var/tmp/portage/sys- libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289 #6 0x419748 in _init (/usr/bin/unzzipcat-mem+0x419748) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /tmp/portage/dev-libs/zziplib-0.13.62- r1/work/zziplib-0.13.62/zzip/memdisk.c:248:20 in zzip_mem_entry_extra_block ==7950==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/00153-zziplib-invalidread-zzip_mem_entry_extra_block 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-invalid-memory-read-in-zzip_mem_entry_extra_block-memdisk-c -- Agostino Sarubbo Gentoo Linux Developer
Current thread:
- zziplib: invalid memory read in zzip_mem_entry_extra_block (memdisk.c) Agostino Sarubbo (Feb 09)