Avast! – Integer Overflow Verifying numFonts in TTC Header
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 |