Path Traversal in Onedev Project
CVE-2021-21251
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3 there is a critical "zip slip" vulnerability. This issue may lead to arbitrary file write. The KubernetesResource REST endpoint untars user controlled data from the request body using TarUtils. TarUtils is 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__ which may not be possible to get without using any of the other reported vulnerabilities. But this should be considered a vulnerability in `io.onedev.commons.utils.TarUtils` since it lives in a different artifact and can affect other projects using it. This issue was addressed in 4.0.3 by validating paths in tar archive to only allow them to be in specified folder when extracted.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.127 (96.2th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.127 · newest: 0.127 · change: 0.000
Affected products
- Onedev Project
- Theonedev Onedev — versions < 4.0.3
Weakness classification (CWE)
References
- github.com/theonedev/onedev/security/advisories/GHSA-2w6j-wc8c-9mq2 (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21251?
- CVE-2021-21251 is a high-severity vulnerability in Onedev Project, classified under Path Traversal. CVSS score: 7.7/10. Published 2021-01-15.
- How severe is CVE-2021-21251?
- High severity. CVSS v3 base score is 7.7 out of 10.