Denial of service in Yara



Published: 2019-08-05
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-5020
CWE-ID CWE-404
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		YARA
Server applications / Server solutions for antivurus protection

Vendor VirusTotal

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Resource Shutdown or Release

EUVDB-ID: #VU19932

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-5020

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

Exploit availability: No

Description

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

The vulnerability exists in the object lookup functionality due to the software reads a negative value to satisfy an assert. A remote attacker can send a specially crafted binary file and cause a DoS condition on the targeted system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

YARA: 3.8.1

External links

http://talosintelligence.com/vulnerability_reports/TALOS-2019-0781
http://github.com/virustotal/yara/releases/tag/v3.10.0
http://github.com/VirusTotal/yara/commit/1ecb0e66431bf5c5b4c2fdf622be969eb5f4a7cc


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

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.



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