CVE-2023-27705

Vulnerability

APNG_Optimizer v1.4 contains a buffer overflow vulnerability triggered by a specially crafted PNG image. The bug resides in the /apngopt/ubuntu.png processing component. No authentication or special configuration is required to reach the vulnerable code path. The exact version affected is 1.4, as distributed from SourceForge [1].

Exploitation

An attacker can achieve exploitation by persuading a user (or a process) to open a malicious PNG file using APNG_Optimizer v1.4. No authentication is needed; the attacker only needs the ability to deliver the crafted file to the target system, either via email, download, or other file transfer. No special permissions or race conditions are involved. The file triggers a buffer overflow during the optimization process.

Impact

Successful exploitation leads to a buffer overflow, which can result in application crash (denial of service) or, potentially, remote code execution (RCE) in the context of the user running the optimizer. This could allow an attacker to compromise the integrity and confidentiality of the affected system, or cause a denial of service.

Mitigation

As of the available references [1], no fixed version of APNG_Optimizer has been released. Users should avoid using APNG_Optimizer v1.4 with untrusted PNG files, or discontinue use of the software until a patch is made available. The project on SourceForge indicates no updates beyond v1.4, so the product may be effectively end-of-life.