#VU16658 Information disclosure in YARA - CVE-2018-19976

Vulnerability identifier: #VU16658

Vulnerability risk: Low

CVSSv4.0: 5.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-19976

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
YARA
Server applications / Server solutions for antivurus protection

Vendor: VirusTotal

Description

The vulnerability allows a local attacker to gain access to potentially sensitive information.

The vulnerability exists due to the design of the YARA virtual machine. A local attacker can execute a compiled rule file that submits malicious input and read uninitialized data from VM scratch memory in libyara/exec.c.

Mitigation
Install update from vendor's website.

Vulnerable software versions

YARA: 3.8.1

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External links
https://github.com/VirusTotal/yara/issues/999

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.