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Date: Sat, 2 Sep 2017 18:41:51 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: libzip: memory allocation failure in _zip_cdir_grow (zip_dirent.c)

Description:
libzip is a library for manipulating zip archives.

The relevant ASan output of the issue:

# ziptool $FILE cat index
==16798==ERROR: AddressSanitizer failed to allocate 0xc0a96a2000 (827476025344) bytes of LargeMmapAllocator (error code: 12)
==16798==Process memory map follows:
==16798==End of process memory map.
==16798==AddressSanitizer CHECK failed: /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/sanitizer_common/sanitizer_common.cc:120 "((0 && "unable to mmap")) != (0)" (0x0, 0x0)
    #0 0x4da9ef in AsanCheckFailed /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/asan_rtl.cc:69
    #1 0x4f5755 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/sanitizer_common/sanitizer_termination.cc:79
    #2 0x4e4d82 in __sanitizer::ReportMmapFailureAndDie(unsigned long, char const*, char const*, int, bool) /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/sanitizer_common/sanitizer_common.cc:120
    #3 0x4ee685 in __sanitizer::MmapOrDie(unsigned long, char const*, bool) /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/sanitizer_common/sanitizer_posix.cc:132
    #4 0x42608a in __sanitizer::LargeMmapAllocator::Allocate(__sanitizer::AllocatorStats*, unsigned long, unsigned long) /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/../sanitizer_common/sanitizer_allocator_secondary.h:41
    #5 0x42608a in __sanitizer::CombinedAllocator<__sanitizer::SizeClassAllocator64, __sanitizer::SizeClassAllocatorLocalCache<__sanitizer::SizeClassAllocator64 >, __sanitizer::LargeMmapAllocator >::Allocate(__sanitizer::SizeClassAllocatorLocalCache<__sanitizer::SizeClassAllocator64 >*, unsigned long, unsigned long, bool, bool) /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/../sanitizer_common/sanitizer_allocator_combined.h:70
    #6 0x42608a in __asan::Allocator::Allocate(unsigned long, unsigned long, __sanitizer::BufferedStackTrace*, __asan::AllocType, bool) /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/asan_allocator.cc:407
    #7 0x420d3f in __asan::asan_realloc(void*, unsigned long, __sanitizer::BufferedStackTrace*) /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/asan_allocator.cc:791
    #8 0x4d0df1 in realloc /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/asan_malloc_linux.cc:93
    #9 0x7f4edab1b7e5 in _zip_cdir_grow /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/lib/zip_dirent.c:108:37
    #10 0x7f4edab1b7e5 in _zip_cdir_new /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/lib/zip_dirent.c:82
    #11 0x7f4edab390d0 in _zip_read_eocd64 /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/lib/zip_open.c:854:13
    #12 0x7f4edab390d0 in _zip_read_cdir /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/lib/zip_open.c:285
    #13 0x7f4edab390d0 in _zip_find_central_dir /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/lib/zip_open.c:613
    #14 0x7f4edab390d0 in _zip_open /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/lib/zip_open.c:200
    #15 0x7f4edab369b7 in zip_open_from_source /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/lib/zip_open.c:148:11
    #16 0x7f4edab35e93 in zip_open /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/lib/zip_open.c:74:15
    #17 0x513392 in read_from_file /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/src/ziptool.c:698:13
    #18 0x513392 in main /var/tmp/portage/dev-libs/libzip-1.2.0/work/libzip-1.2.0/src/ziptool.c:1113
    #19 0x7f4ed9c43680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
    #20 0x41b058 in _init (/usr/bin/ziptool+0x41b058)

Affected version:
1.2.0

Fixed version:
1.3.0

Commit fix:
https://github.com/nih-at/libzip/commit/9b46957ec98d85a572e9ef98301247f39338a3b5

Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.

CVE:
CVE-2017-14107

Reproducer:
https://github.com/asarubbo/poc/blob/master/00330-libzip-memallocfailure-_zip_cdir_grow

Timeline:
2017-08-24: bug discovered and reported to upstream
2017-08-29: upstream released a fix
2017-09-01: blog post about the issue
2017-09-01: CVE assigned

Note:
This bug was found with American Fuzzy Lop.
This bug was identified with bare metal servers donated by Packet. This work is also supported by the Core Infrastructure Initiative.

Permalink:
https://blogs.gentoo.org/ago/2017/09/01/libzip-memory-allocation-failure-in-_zip_cdir_grow-zip_dirent-c/

--
Agostino Sarubbo
Gentoo Linux Developer


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