Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2021-43521
CVE-2021-43521:
NixOS vulnerability analysis and mitigation
Overview
A Buffer Overflow vulnerability was discovered in zlog version 1.2.15. The vulnerability exists in the zlogconfbuildwithfile function within src/zlog/src/conf.c. This security issue was assigned CVE-2021-43521 and was publicly disclosed on November 3, 2021 (MITRE, NVD).
Technical details
The vulnerability is a stack-buffer-overflow that occurs in the zlogconfbuildwithfile function. The issue involves a byte read overflow that can underflow the 'line' buffer. If specific memory conditions are met (such as encountering values like 0x20 or 0x90 that represent spaces), subsequent pointer operations can lead to write overflow conditions (GitHub Issue). The vulnerability has been assigned a CVSS score of 5.0, indicating medium severity (CISA).
Impact
The exploitation of this vulnerability could potentially lead to denial of service conditions or system crashes. In certain circumstances, it might also allow for information disclosure or memory corruption (NVD).
Additional resources
Source: This report was generated using AI
Related NixOS vulnerabilities:
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