#VU79711 Improper Validation of Array Index in WinRAR - CVE-2023-40477

Vulnerability identifier: #VU79711

Vulnerability risk: High

CVSSv4.0: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2023-40477

CWE-ID: CWE-129

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
WinRAR
Client/Desktop applications / Software for archiving

Vendor: RARLAB

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to improper validation of array index when processing recovery volumes. A remote attacker can trick the victim to open a specially crafted archive and execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

WinRAR: 6.00 - 6.22

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External links
https://www.zerodayinitiative.com/advisories/ZDI-23-1152/
https://www.win-rar.com/singlenewsview.html?&L=0&tx_ttnews%5Btt_news%5D=232&cHash=c5bf79590657e32554c6683296a8e8aa

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.