CVE-2023-34308

(0Day) Ashlar-Vellum Graphite VC6 File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

CVE ID CVE-2023-34308

CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

AFFECTED VENDORS Ashlar-Vellum

AFFECTED PRODUCTS Graphite

VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Graphite. 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 a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS

10/04/22 – ZDI reported the vulnerability to the vendor.

10/05/22 – The vendor acknowledged the report.

06/07/23 – The ZDI asked for an update.

06/08/23 – The vendor states that the vulnerability would be fixed in a future build.

06/08/23 – The ZDI informed the vendor that the case will be published as a zero-day advisory on 06/15/23. 

Mitigation: Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the application.

DISCLOSURE TIMELINE

2022-10-04 - Vulnerability reported to vendor

2023-06-15 - Coordinated public release of advisory

CREDIT Rocco Calvi (@TecR0c) with TecSecurity