Uncontrolled Recursion in YARA - CVE-2017-9438

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Main Vulnerability Database Vulnerabilities #VU38920

Uncontrolled Recursion in YARA - CVE-2017-9438

Published: June 5, 2017 / Updated: August 8, 2020


Vulnerability identifier: #VU38920
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-2017-9438
CWE-ID: CWE-674
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/re.c in the regexp module in YARA 3.5.0 allows remote attackers to cause a denial of service (stack consumption) via a crafted rule (involving hex strings) that is mishandled in the _yr_re_emit function, a different vulnerability than CVE-2017-9304.


Affected software

YARA
Fedora
Ubuntu
yara (Ubuntu package)
yara
python-yara

How to mitigate CVE-2017-9438

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 3.6.2-1.el6, 3.6.3-1.el6, 3.11.0-1.el6, 4.1.0-1.el7, 4.1.0-1.el8, 4.1.0-1.fc33, 4.1.0-1.fc34
python-yara - addressed in versions 4.1.0-1.el7, 4.1.0-1.el8, 4.1.0-1.fc33, 4.1.0-1.fc34

External References

Related Security Bulletins