Exploit Avast! - Integer Overflow Verifying numFonts in TTC Header

[Exploiter]

EDB-ID

38934

Проверка EDB

1. Пройдено

Автор

GOOGLE SECURITY RESEARCH

Тип уязвимости

DOS

Платформа

WINDOWS

CVE

null

Дата публикации

2015-12-10

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