#VU56930 Path traversal in ClairCore - CVE-2021-3762

Vulnerability identifier: #VU56930

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3762

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ClairCore
Universal components / Libraries / Libraries used by multiple products

Vendor: Red Hat Inc.

Description

The vulnerability allows a remote attacker to write arbitrary files to the system.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote attacker can supply a specially crafted container image which, when scanned by Clair, will allow to write arbitrary files on he filesystem.

Successful exploitation of the vulnerability may allow an attacker to compromise the affected system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ClairCore: 0.4.0 - 0.4.7, 0.5.0 - 0.5.4

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2000795

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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.