CVE-2023-40477
Published: 03 May 2024
Summary
CVE-2023-40477 is a high-severity Improper Validation of Array Index (CWE-129) vulnerability in Rarlab Winrar. Its CVSS base score is 7.8 (High).
Operationally, ranked in the top 0.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
RARLAB WinRAR contains an improper validation of array index vulnerability (CWE-129) in its handling of recovery volumes. The flaw permits an out-of-bounds memory access when processing specially crafted recovery data, enabling remote code execution on affected installations. The issue was originally reported as ZDI-CAN-21233 and carries a CVSS 3.0 score of 7.8.
Remote attackers can trigger the vulnerability by supplying a malicious recovery volume that a user must open or that is reached via a malicious web page. Successful exploitation grants arbitrary code execution in the context of the current WinRAR process; no privileges are required beyond normal user interaction with the file.
Vendor advisories and the Zero Day Initiative disclosure point to updated WinRAR builds that correct the recovery-volume processing logic. The Debian LTS announcement similarly references backported fixes for supported releases. EPSS scores remain elevated near 0.92, indicating sustained exploitation interest following public disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-45048
Vulnerability details
RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of RARLAB WinRAR. User interaction is required to exploit this vulnerability in that the target…
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must visit a malicious page or open a malicious file. The specific flaw exists within the processing of recovery volumes. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-21233.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.