(0Day) Ashlar-Vellum Cobalt XE 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 XE 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
04/14/25 – ZDI reported the vulnerability to the vendor
04/23/25 – the vendor acknowledged the receipt of the report
07/30/25 – ZDI asked for updates
08/06/25 - ZDI asked for updates
10/06/2025 – The vendor communicated that the fix will be available in the upcoming update
10/15/25 - 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
- 2025-04-14 - Vulnerability reported to vendor
- 2025-10-16 - Coordinated public release of advisory
- 2025-10-16 - Advisory Updated
Credit
Rocco Calvi (@TecR0c) with TecSecurity
