Out-of-bounds read in YARA - CVE-2017-8294
Published: April 27, 2017 / Updated: January 26, 2021
Vulnerability identifier: #VU39100
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-2017-8294
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to perform denial of service (DoS) attack.
The vulnerability exists due to a boundary condition within the the regex component function in YARA 3.5.0 allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted rule that is mishandled file. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger out-of-bounds read error and crash the affected application.
Affected software
YARA
Fedora
Ubuntu
yara (Ubuntu package)
yara
Fedora
Ubuntu
yara (Ubuntu package)
yara
How to mitigate CVE-2017-8294
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
yara - addressed in versions 3.5.0-7.el7, 3.5.0-7.fc24, 3.5.0-7.fc25, 3.5.0-7.fc26