CVE-2019-5020

NameCVE-2019-5020
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
yara (PTS)jessie3.1.0-2+deb8u1fixed
stretch3.5.0+dfsg-9fixed
buster3.9.0-1fixed
bullseye, sid3.11.0-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
yarasource(unstable)3.9.0-1
yarasourcejessie(not affected)
yarasourcestretch(not affected)

Notes

[stretch] - yara <not-affected> (dex module introduced in 3.8.0)
[jessie] - yara <not-affected> (dex module introduced in 3.8.0)
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0781
https://github.com/VirusTotal/yara/issues/1023
https://github.com/VirusTotal/yara/commit/1ecb0e66431bf5c5b4c2fdf622be969eb5f4a7cc
https://github.com/VirusTotal/yara/commit/a3784d3855029bd0ad24071e72746cc0c31b8cba

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