CVE-2020-23886: 
XnView MP vulnerability analysis and mitigation

XnView MP v0.96.4 contains a heap overflow vulnerability identified as CVE-2020-23886. The vulnerability was discovered in the application's handling of PICT files, where a crafted file can trigger a heap overflow condition. This security issue is related to a User Mode Write Access Violation starting at ntdll!RtlpLowFragHeapFree (NVD).

The vulnerability is classified as a heap-based buffer overflow (CWE-122). According to the CVSS v3.1 scoring, it has a base score of 5.5 (MEDIUM) with the vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. The issue occurs when processing specially crafted PICT files, leading to a heap overflow condition that can be triggered through the application's file handling mechanism (NVD).

When exploited, the vulnerability allows attackers to cause a denial of service (DoS) condition through the application crash. The heap overflow can be triggered by processing a specially crafted PICT file, potentially affecting system stability and application availability (NVD).

The vulnerability can be exploited by providing a specially crafted PICT file to the application. Technical analysis shows that the exploit triggers a User Mode Write Access Violation, which has been classified as EXPLOITABLE by security researchers (Github Exploit).

Users should upgrade to a version newer than XnView MP v0.96.4. The vendor has released updated versions of the software that address this vulnerability (XnView Website).