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LibTIFF 4.0.8 Memory Leak

LibTIFF 4.0.8 Memory Leak
Posted Dec 21, 2018
Authored by Jiawang Zhang

LibTIFF version 4.0.8 suffers from multiple memory leak vulnerabilities.

tags | advisory, vulnerability, memory leak, info disclosure
advisories | CVE-2017-16232
SHA-256 | 99b39c7e3e305f25232c535712f3fc0ca2051fdcf102d69777eda04623c5b380

LibTIFF 4.0.8 Memory Leak

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#CVE-2017-16232
# LibTIFF 4.0.8 has multiple memory leak vulnerabilities (CVE-2017-16232)
## Product Download: http://www.libtiff.org/ http://download.osgeo.org/libtiff/
## Vulnerability TypePSomemory leak
## Attack Type : local
## Vulnerability Description
LibTIFF 4.0.8 has multiple memory leak vulnerabilities, which allow
attackers to cause a denial of service (memory consumption), as demonstrated
by tif_open.c, tif_lzw.c, and tif_aux.c
## POC
https://github.com/followboy1999/poc/tree/master/CVE-2017-16232

./tiff2bw libtiff_poc.tif 222.tif
LZWDecode: Not enough data at scanline 0 (short 6442443006 bytes).
> /usr/local/bin/llvm-symbolizer: /lib/x86_64-linux-gnu/libtinfo.so.5: no version information available (required by /usr/local/bin/llvm-symbolizer)
>
> =================================================================
> ==25328==ERROR: LeakSanitizer: detected memory leaks
>
> Direct leak of 6442451106 byte(s) in 1 object(s) allocated from:
> #0 0x4bbfd3 in __interceptor_malloc /home/brian/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:67:3
> #1 0x4e88be in main /home/zzt/Fuzzing/Victims/ASAN/tiff-4.0.8/tools/tiff2bw.c:258:28
> #2 0x7f293f0fdabf in __libc_start_main /build/glibc-qbmteM/glibc-2.21/csu/libc-start.c:289
>
> Direct leak of 1137 byte(s) in 1 object(s) allocated from:
> #0 0x4bbfd3 in __interceptor_malloc /home/brian/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:67:3
> #1 0x54d6b6 in TIFFClientOpen /home/zzt/Fuzzing/Victims/tiff-4.0.8/libtiff/tif_open.c:119
>
> Indirect leak of 81904 byte(s) in 1 object(s) allocated from:
> #0 0x4bbfd3 in __interceptor_malloc /home/brian/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:67:3
> #1 0x5ea2e9 in LZWSetupDecode /home/zzt/Fuzzing/Victims/tiff-4.0.8/libtiff/tif_lzw.c:232
>
> Indirect leak of 2273 byte(s) in 5 object(s) allocated from:
> #0 0x4bc3d7 in realloc /home/brian/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:98:3
> #1 0x56f5db in _TIFFCheckRealloc /home/zzt/Fuzzing/Victims/tiff-4.0.8/libtiff/tif_aux.c:73
> #2 0x56f5db in _TIFFCheckMalloc /home/zzt/Fuzzing/Victims/tiff-4.0.8/libtiff/tif_aux.c:88
>
> Indirect leak of 1240 byte(s) in 2 object(s) allocated from:
> #0 0x4bc3d7 in realloc /home/brian/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:98:3
> #1 0x56f430 in _TIFFCheckRealloc /home/zzt/Fuzzing/Victims/tiff-4.0.8/libtiff/tif_aux.c:73

## Versions:LibTIFF 4.0.8
## Impact:Denial of Service
## Credit
This vulnerability was discovered by Jiawang Zhang Coordination Center of China (CNCERT/CC)
## References
CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16232
https://github.com/shelltdf/libtiff/commit/25f9ffa56548c1846c4a1f19308b7f561f7b1ab0


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