Comments (2)
Yes, CVE-2017-6419 was found by a fuzzer against ClamAV's use of libmspack. The ClamAV team added a bounds check at the exact place that AddressSanitizer listed, but didn't look at the wider picture. There shouldn't be a bounds check necessary there, as per the logic of the comment immediately preceding it. My commit 6139a0b addresses the root cause, which is chmd.c not rejecting negative values in SpanInfo, and lzxd.c not rejecting invalid LZX output_length values, thus resulting in frame_size
, bytes_todo
and this_run
becoming a value larger than LZX_FRAME_SIZE
.
CVE-2017-11423 is a separate issue, fixed by commit 1703820, where cabd_read_string
didn't check the return code of mspack_system.read
for errors, and interprets negative error codes as a large number of bytes read. However, only ClamAV is susceptible to this being triggered from crafted file contents alone, because it also had a bug in its custom mspack_system
implementation. Anything using the default mspack_system
which passes reads to fread()
cannot be made to generate a read error based on file contents.
from libmspack.
Thank you.
from libmspack.
Related Issues (20)
- cabextract doesn't build from master HOT 2
- memory exhausted in oabd_decompress() HOT 2
- memory exhausted in chmd_read_headers() HOT 1
- Heap buffer overflow in chmd_read_headers() HOT 7
- Multiple filters in one command HOT 6
- 1.9.1: issue with dist tar ball HOT 2
- Not clear on Github how to get libmspack vs cabextract releases HOT 17
- chmextract HOT 2
- Conflicting definitions for copy_fh HOT 3
- configure / libtool fails with -flto HOT 12
- configure / libtool fails with -flto HOT 6
- Compilier warnings with 1.9.1 HOT 4
- Compiler error with 1.9.1 / gcc 9.3.1 HOT 5
- Malloc size error in chmd.c:1327:34 HOT 2
- extra = 0 confusion HOT 4
- build fails on macos HOT 1
- cabextract: Writing into symlinks HOT 11
- Issue with KWAJ method 2 decompression HOT 2
- Fail to properly create path components coming from the archive HOT 3
- Cannot extract files from a .cab file containing file names encoded in shift_JIS HOT 1
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