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CVE-2023-34289: Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability

• Severity: high (CVSS 7.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-03 · updated 2026-06-17
• Weakness: CWE-122

Description

Ashlar-Vellum Cobalt Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of AR files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. . Was ZDI-CAN-17985.

Affected products

• Ashlar-Vellum Cobalt: before 12.0.1204.54 — fixed in 12.0.1204.54

How to fix

Upgrade to a fixed version: Ashlar-Vellum Cobalt 12.0.1204.54. Check the vendor advisory for mitigations.

References

• https://www.zerodayinitiative.com/advisories/ZDI-23-827/
• https://www.zerodayinitiative.com/advisories/ZDI-23-827/

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