Rar - CmdExtract::UnstoreFile Integer Truncation Memory Corruption
🗓️ 10 Dec 2015 00:00:00Reported by Google Security ResearchType 
exploitdb🔗 www.exploit-db.com👁 26 Views
Source: https://code.google.com/p/google-security-research/issues/detail?id=550
The attached file crashes in CmdExtract::UnstoreFile because the signed int64 DestUnpSize is truncated to an unsigned 32bit integer. Perhaps CmdExtract::ExtractCurrentFile should sanity check Arc.FileHead.UnpSize early.
I observed this crash in Avast Antivirus, but the origin of the code appears to be the unrar source distribution. I imagine many other antiviruses will be affected, and presumably WinRAR and other archivers.
Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/38930.zipData
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10 Dec 2015 00:00Current
5.3Medium risk
Vulners AI Score5.3