Avast! - Integer Overflow Verifying numFonts in TTC Header



EKU-ID: 43300 CVE: OSVDB-131561 OSVDB-ID:
Author: Google Security Research Published: 2015-12-10 Verified: Verified
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Source: https://code.google.com/p/google-security-research/issues/detail?id=549

If the numFonts field in the TTC header is greater than (SIZE_MAX+1) / 4, an integer overflow occurs in filevirus_ttf() when calling CSafeGenFile::SafeLockBuffer.

The TTC file format is described here https://www.microsoft.com/typography/otspec/otff.htm

Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38934.zip