#VU12172 Use-after-free error in ClamAV - CVE-2017-6420

Vulnerability identifier: #VU12172

Vulnerability 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-2017-6420

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ClamAV
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: ClamAV

Description
The vulnerability allows a rmeote attacker to cause DoS condition on the target system.

The weakness exists in libclamav/wwunpack.c due to use-after-free error. A remote attacker can trick the victim into opening a specially crafted PE file with WWPack compression, trigger memory corruption and cause the service to crash.

Mitigation
Update to version 0.99.3.

Vulnerable software versions

ClamAV: 0.99.2

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External links
https://github.com/Cisco-Talos/clamav-devel/commit/dfc00cd3301a42b571454b51a6102eecf58407bc

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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.