oss-sec mailing list archives
zziplib: out of bounds read in zzip_mem_entry_new (memdisk.c)
From: Agostino Sarubbo <ago () gentoo org>
Date: Thu, 09 Feb 2017 14:46:31 +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 out of bounds read. The complete ASan output: # unzzipcat-mem $FILE ==7934==ERROR: AddressSanitizer: unknown-crash on address 0x7f439a704000 at pc 0x0000004bb815 bp 0x7fff911ebe30 sp 0x7fff911eb5e0 READ of size 59396 at 0x7f439a704000 thread T0 #0 0x4bb814 in __asan_memcpy /tmp/portage/sys-devel/llvm-3.9.0- r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:413 #1 0x7f439a3da299 in zzip_mem_entry_new /tmp/portage/dev- libs/zziplib-0.13.62-r1/work/zziplib-0.13.62/zzip/memdisk.c:210:13 #2 0x7f439a3da299 in zzip_mem_disk_load /tmp/portage/dev- libs/zziplib-0.13.62-r1/work/zziplib-0.13.62/zzip/memdisk.c:137 #3 0x7f439a3d98b7 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 0x7f439951961f 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 describe address in more detail (wild memory access suspected). SUMMARY: AddressSanitizer: unknown-crash /tmp/portage/sys-devel/llvm-3.9.0- r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:413 in __asan_memcpy Shadow bytes around the buggy address: 0x0fe8f34d87b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fe8f34d87c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fe8f34d87d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fe8f34d87e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fe8f34d87f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0fe8f34d8800:[fe]fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe 0x0fe8f34d8810: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe 0x0fe8f34d8820: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe 0x0fe8f34d8830: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe 0x0fe8f34d8840: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe 0x0fe8f34d8850: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==7934==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/00156-zziplib-oobread-zzip_mem_entry_new 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-out-of-bounds-read-in-zzip_mem_entry_new-memdisk-c -- Agostino Sarubbo Gentoo Linux Developer
Current thread:
- zziplib: out of bounds read in zzip_mem_entry_new (memdisk.c) Agostino Sarubbo (Feb 09)