Out-of-bounds read in YARA - CVE-2017-5923

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Main Vulnerability Database Vulnerabilities #VU39292

Out-of-bounds read in YARA - CVE-2017-5923

Published: April 3, 2017 / Updated: August 8, 2020


Vulnerability identifier: #VU39292
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-5923
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

libyara/grammar.y in YARA 3.5.0 allows remote attackers to cause a denial of service (heap-based out-of-bounds read and application crash) via a crafted rule that is mishandled in the yara_yyparse function.


Affected software

YARA
Fedora
Ubuntu
yara (Ubuntu package)
yara

How to mitigate CVE-2017-5923

Install update from vendor's website.

yara (Ubuntu package) - addressed in versions 3.4.0+dfsg-2ubuntu0.1~esm1, 3.7.1-1ubuntu2+esm1, 3.9.0-1ubuntu0.1~esm1
yara - addressed in versions 3.5.0-7.el7, 3.5.0-7.fc24, 3.5.0-7.fc25, 3.5.0-7.fc26, 3.6.0-1.el7, 3.6.0-1.fc24, 3.6.0-1.fc25, 3.6.0-1.fc26, 3.11.0-1.el6

External References

Related Security Bulletins