Vulnerability identifier: #VU48108

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-13355

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Gitlab Community Edition
Universal components / Libraries / Software for developers
GitLab Enterprise Edition
Universal components / Libraries / Software for developers

Vendor: GitLab, Inc

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in LFS Upload. A remote attacker can send a specially crafted HTTP request and overwrite certain specific paths on the server.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Gitlab Community Edition: 8.14 - 13.5.1

GitLab Enterprise Edition: 8.14.0 - 13.5.1

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External links
http://about.gitlab.com/releases/2020/11/02/security-release-gitlab-13-5-2-released/

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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.