Symantec RAR Decomposer Engine (Multiple Products) - Out-of-Bounds Read / Out-of-Bounds Write

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=867

In issue 810 we pointed out to Symantec that they hadn't updated their unrar based unpacker for years, and it was vulnerable to dozens of publicly documented flaws.

I had expected Symantec to rebase on 5.4.2 (the latest version as of this writing), but they appear to have just backported fixes for the few issues I sent them.

Here are two known bugs in unrar that are fixed upstream, but not in Symantec's ancient code. If they continue to refuse to rebase, this might take a few iterations to shake the bugs out. Sigh.

As in issue 810, these are remote code execution vulnerabilities at the highest possible privilege level.


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40405.zip