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Vulnerability DatabaseCVE-2021-20300
CVE-2021-20300:
NixOS vulnerability analysis and mitigation
Overview
A flaw was discovered in OpenEXR's hufUncompress functionality located in OpenEXR/IlmImf/ImfHuf.cpp. The vulnerability, identified as CVE-2021-20300, allows an attacker who can submit a crafted file to trigger an integer overflow when processed by OpenEXR (Debian Tracker).
Technical details
The vulnerability occurs in the hufUncompress function where nBits+7 could overflow in the calculation of if ( ptr + (nBits+7)/8 > compressed+nCompressed). This integer overflow condition arises when nBits is too large. The issue was addressed by casting to a 64-bit type to prevent the overflow (Red Hat Bugzilla).
Impact
The primary impact of this vulnerability is to system availability. If successfully exploited, it could lead to application crashes when processing specially crafted files (Debian Tracker).
Mitigation and workarounds
The vulnerability was fixed in multiple versions across different distributions. For Debian 10 (buster), it was addressed in version 2.2.1-4.1+deb10u2. The fix was also included in OpenEXR 3.0.0-beta. The patch involves modifying the calculation to use 64-bit integers to prevent the overflow condition (Debian LTS).
Additional resources
Source: This report was generated using AI
Related NixOS vulnerabilities:
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