CVE-2020-37239 -- CVSS 9.8 Vulnerability Briefing

CVE-2020-37239 | CVSS 9.8 (Critical) | Exploit: No known exploit

What Is It

CVE-2020-37239 is a broken double-free detection vulnerability in libbabl 0.1.62, a pixel encoding and color space conversion library used primarily by image processing applications such as GIMP.

Technical Detail

The flaw exists in libbabl's memory management routines, where the double-free detection mechanism can be bypassed by overwriting the signature field in a freed memory chunk before a second free operation is attempted. An attacker who can influence memory allocation patterns, such as through crafted image input processed by an application using libbabl, may be able to corrupt heap memory in a way that bypasses the safety check. Successful exploitation could lead to arbitrary code execution in the context of the application processing the malicious input, given the nature of heap corruption primitives this class of vulnerability typically provides.

Exploitation Status

No known exploit exists for this vulnerability at this time. It is not listed in the CISA Known Exploited Vulnerabilities catalog, and no public proof-of-concept code has been identified. Despite the critical CVSS score of 9.8, exploitation has not been observed in the wild as of the date of this briefing.

Who Is Targeting This

No specific threat actor attribution at this time. Neither confirmed nor reported threat actor activity has been associated with this CVE in available intelligence sources.

What To Do

Organizations using applications that depend on libbabl, including GIMP and other GEGL-based tools, should update to a version of libbabl beyond 0.1.62 that addresses this memory safety flaw. Verify with your distribution's package manager or upstream vendor whether a patched release is available and apply it promptly given the critical severity rating. As a general precaution, avoid processing untrusted or externally sourced image files with unpatched versions of affected applications. Monitor vendor advisories from the GNOME project and downstream Linux distribution security channels for patch availability and additional guidance.