#VU98812 Buffer overflow in YARA - CVE-2021-45429

Vulnerability identifier: #VU98812

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-45429

CWE-ID: CWE-120

Exploitation vector: Network

Exploit availability: No

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

Vendor: VirusTotal

Description

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

The vulnerability exists due to a boundary error within the yr_set_configuration() function in yara/libyara/libyara.c. A remote attacker can trick the victim into loading a specially crafted file and crash the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

YARA: before 4.2.0

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External links
https://github.com/VirusTotal/yara/issues/1616

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.