Remote code execution in WinRAR

1) Improper Validation of Array Index

EUVDB-ID: #VU79711

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 - Improper Validation of Array Index

Exploit availability: Yes

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

CPE2.3

• cpe:2.3:a:rarlab:winrar:6.00:*:*:*:*:*:*:*
• cpe:2.3:a:rarlab:winrar:6.01:beta 1:*:*:*:*:*:*
• cpe:2.3:a:rarlab:winrar:6.01:*:*:*:*:*:*:*

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted archive.

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.