Avast! - Integer Overflow Verifying numFonts in TTC Header

EDB-ID:

38934

CVE:


EDB Verified:

Author:

Google Security Research

Type:

dos

Exploit:   /  

Platform:

Windows

Date:

2015-12-10

Vulnerable App: 
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
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