Denial of service in ClamAV XAR

1) Out-of-bounds read

EUVDB-ID: #VU11136

Risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/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-2018-1000085

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists in the xar_hash_check() function due to insufficient validation of user-supplied input. A remote attacker can send a specially crafted XAR file, trick the victim into opening it, trigger out-of-bounds heap memory read and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ClamAV: 0.97.0 - 0.99.3

CPE2.3

• cpe:2.3:a:clamav:clamav_antivirus:0.97.0:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.97.1:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.97.2:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.97.3:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.97.4:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.97.5:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.97.6:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.98.0:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.98.5:*:*:*:*:*:*:*
• cpe:2.3:a:clamav:clamav_antivirus:0.98.7:*:*:*:*:*:*:*

External links

https://github.com/Cisco-Talos/clamav-devel/commit/d96a6b8bcc7439fa7e3876207aa0a8e79c8451b6

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.