(0Day) Ashlar-Vellum Cobalt VC6 File Parsing Integer Overflow Remote Code Execution Vulnerability
Vulnerability Details
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 VC6 files. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.
Additional Details
11/21/24 – ZDI reported the vulnerability to the vendor
11/22/24 – the vendor acknowledged the receipt of the report
03/12/25 - ZDI asked for updates
03/20/25 – the vendor confirmed that resolving the issue was in progress
05/02/25 - ZDI asked for updates
07/15/25 – ZDI notified the vendor of the intention to publish the case as a 0-day advisory
-- Mitigation: Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the product
Disclosure Timeline
- 2024-11-21 - Vulnerability reported to vendor
- 2025-07-22 - Coordinated public release of advisory
- 2025-07-22 - Advisory Updated
Credit
Rocco Calvi (@TecR0c) with TecSecurity
