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7.8

libmspack 0.5alpha can crash when opening malicious CHM files

CVE-2017-6419 · published 9 years ago
Summary

The libmspack library used for reading CHM (help) files can be forced to stop working by a specially crafted CHM file. This could cause the application that relies on the library, such as ClamAV, to stop scanning or become unavailable. Update to a newer libmspack version or apply the vendor's patch, and avoid processing CHM files from untrusted sources.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
libmspack_project libmspack 0.5
cpe:2.3:a:libmspack_project:libmspack:0.5:alpha:*:*:*:*:*:*
Original advisory text
mspack/lzxd.c in libmspack 0.5alpha, as used in ClamAV 0.99.2, allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified o...
mspack/lzxd.c in libmspack 0.5alpha, as used in ClamAV 0.99.2, allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted CHM file.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
7.8 High
Exploitation
2% chance of attack within 30 days
Type
CWE-119Buffer Overflow
Timeline
Published7 Aug 2017
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2017-6419 · NVD
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