Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2020-27798
CVE-2020-27798:
NixOS vulnerability analysis and mitigation
Overview
An invalid memory address reference vulnerability was discovered in the adjABS function in p_lx_elf.cpp in UPX 4.0.0. The vulnerability can be triggered via a crafted Mach-O file (NVD).
Technical details
The vulnerability occurs in the PackLinuxElf64::adjABS function where an invalid memory address reference can lead to a segmentation fault. The issue stems from the get_str_name function returning an unreadable value (0xff) which causes a crash in the strcmp function. The vulnerability has been assigned a CVSS v3.1 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 (NVD, GitHub Issue).
Impact
When exploited, this vulnerability can cause a segmentation fault in the application, leading to a denial of service condition. The CVSS scoring indicates that while there is no impact on confidentiality or integrity, there is a high impact on availability (NVD).
Mitigation and workarounds
The vulnerability has been fixed in UPX version 4.2.2-1 and later releases. Users are advised to upgrade to the latest version to mitigate this vulnerability (Debian Tracker).
Additional resources
Source: This report was generated using AI
Related NixOS vulnerabilities:
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