CVE Vulnerabilities

CVE-2017-6420

Use After Free

Published: Aug 07, 2017 | Modified: Apr 20, 2025
CVSS 3.x
5.5
MEDIUM
Source:
NVD
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.x
4.3 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM

The wwunpack function in libclamav/wwunpack.c in ClamAV 0.99.2 allows remote attackers to cause a denial of service (use-after-free) via a crafted PE file with WWPack compression.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Name Vendor Start Version End Version
Clamav Clamav 0.99.2 (including) 0.99.2 (including)
Clamav Ubuntu devel *
Clamav Ubuntu esm-infra-legacy/trusty *
Clamav Ubuntu esm-infra/xenial *
Clamav Ubuntu trusty *
Clamav Ubuntu trusty/esm *
Clamav Ubuntu upstream *
Clamav Ubuntu xenial *
Clamav Ubuntu zesty *

Potential Mitigations

References