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CVE-2019-5020

Published: 31 July 2019

An exploitable denial of service vulnerability exists in the object lookup functionality of Yara 3.8.1. A specially crafted binary file can cause a negative value to be read to satisfy an assert, resulting in Denial of Service. An attacker can create a malicious binary to trigger this vulnerability.

Notes

AuthorNote
ebarretto
upstream fix introduced a regression, please check if all necessary
commits are included when patching.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
yara
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
disco Ignored
(end of life)
eoan
Released (3.9.0-1)
trusty Does not exist

upstream
Released (3.9.0-1)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://github.com/VirusTotal/yara/commit/1ecb0e66431bf5c5b4c2fdf622be969eb5f4a7cc
upstream: https://github.com/VirusTotal/yara/commit/a3784d3855029bd0ad24071e72746cc0c31b8cba

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H