[3.7] libmspack: Multiple vulnerabilities (CVE-2018-18584, CVE-2018-18585, CVE-2018-18586)
CVE-2018-18584: A CAB file with a Quantum-compressed block of exactly 38912 bytes will write one byte beyond the end of the input buffer
In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8,
the CAB
block input buffer is one byte too small for the maximal Quantum block,
leading to an out-of-bounds write.
References:
https://www.cabextract.org.uk/libmspack/
https://nvd.nist.gov/vuln/detail/CVE-2018-18584
Patch:
https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2
CVE-2018-18585: CHM files with blank filenames (by having embedded nulls) are allowed, which trips up clients that expect non-blank filenames
chmd_read_headers in mspack/chmd.c in libmspack before 0.8alpha
accepts a filename
that has ‘\0’ as its first or second character (such as the “/\0”
name).
References:
https://www.cabextract.org.uk/libmspack/
https://nvd.nist.gov/vuln/detail/CVE-2018-18585
Patch:
https://github.com/kyz/libmspack/commit/8759da8db6ec9e866cb8eb143313f397f925bb4f
CVE-2018-18586: chmextract makes no attempt to protect you from relative/absolute paths in CHM filenames
DISPUTED chmextract.c in the chmextract sample program, as distributed with libmspack before 0.8alpha, does not protect against absolute/relative pathnames in CHM files, leading to Directory Traversal. NOTE: the vendor disputes that this is a libmspack vulnerability, because chmextract.c was only intended as a source-code example, not a supported application.
References:
https://www.cabextract.org.uk/libmspack/
https://nvd.nist.gov/vuln/detail/CVE-2018-18586
Patch:
https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d
(from redmine: issue id 9665, created on 2018-11-21, closed on 2018-11-28)
- Relations:
- parent #9662 (closed)
- Changesets:
- Revision c9b4a96e by Natanael Copa on 2018-11-27T12:32:31Z:
main/libmspack: security upgrade to 0.8_alpha
CVE-2018-18584, CVE-2018-18585, CVE-2018-18586
fixes #9665