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Vulnerability DatabaseCVE-2021-3903
CVE-2021-3903:
NixOS vulnerability analysis and mitigation
Overview
CVE-2021-3903 is a heap-based buffer overflow vulnerability affecting the Vim text editor. The vulnerability was discovered in October 2021 and affects various versions of Vim. When exploited, this vulnerability could allow an attacker to cause memory to be read outside of the bounds of the buffer (CVE Mitre, Debian LTS).
Technical details
The vulnerability occurs when scrolling without a valid screen, leading to invalid memory access. The issue was addressed in patch 8.2.3564 by removing the VALIDBOTLINE flag setting in wvalid (Vim Commit). The vulnerability was assigned a security impact rating of Moderate by Red Hat (Fedora Update).
Impact
The vulnerability could result in a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer, potentially leading to a denial-of-service condition (Red Hat CVE).
Mitigation and workarounds
The vulnerability has been patched in various distributions. Fedora released version 8.2.3568-1 for affected versions (Fedora Update), and Debian included fixes in version 2:8.0.0197-4+deb9u7 (Debian LTS). Users are recommended to upgrade to the patched versions.
Additional resources
Source: This report was generated using AI
Related NixOS vulnerabilities:
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