PT-2021-14361 · Apache · Apache Commons Compress

Pwntester · Published 2021-01-15 · Updated 2021-01-21 · CVE-2021-21251

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: OneDev versions prior to 4.0.3

Description: OneDev is an all-in-one devops platform with a critical "zip slip" vulnerability that may lead to arbitrary file write. The KubernetesResource REST endpoint untars user-controlled data from the request body using TarUtils, a custom library method leveraging Apache Commons Compress. During the untar process, there are no checks in place to prevent an untarred file from traversing the file system and overriding an existing file. For a successful exploitation, the attacker requires a valid JobToken. This issue is considered a vulnerability in io.onedev.commons.utils.TarUtils since it can affect other projects using it.

Recommendations: For versions prior to 4.0.3, update to version 4.0.3 or later, which validates paths in the tar archive to only allow them to be in a specified folder when extracted. As a temporary workaround, consider restricting access to the KubernetesResource REST endpoint or disabling the TarUtils function until a patch is available. Avoid using the JobToken in the affected API endpoint until the issue is resolved.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2021-21251

GHSA-2W6J-WC8C-9MQ2

Affected Products

Apache Commons Compress

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-21251 · Security Note
• https://osv.dev/vulnerability/CVE-2021-21251 · Vendor Advisory
• https://github.com/theonedev/onedev/security/advisories/GHSA-2w6j-wc8c-9mq2 · Note
• https://t.me/cibsecurity/22230 · Telegram Post
• https://t.me/cvenotify/8618 · Telegram Post