Vulnerability in OneDev is an all-in-one devops platform. In… (CVE-2021-21251)

Summary

Vulnerability in OneDev is an all-in-one devops platform. In OneDev (CVE-2021-21251). Successful exploitation can lead to full system takeover. Exploitable via io.onedev.commons.utils.TarUtils.

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2021-21251 has been found in OneDev is an all-in-one devops platform. In OneDev.
Attackers can target a specific entry point like io.onedev.commons.utils.TarUtils over the network to misuse the product.
Successful exploitation can lead to full system takeover.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "OneDev is an all-in-one devops platform. In OneDev CVE-2021-21251" on the vendor's site.

CVE-2021-21251 (OneDev is an all-in-one devops platform. In OneDev)
Attack vector: remote (network-reachable) / no user interaction
Attack surface: io.onedev.commons.utils.TarUtils
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (unclassified) exists in OneDev is an all-in-one devops platform. In OneDev. Attackers reach the vulnerable code path via io.onedev.commons.utils.TarUtils.

📍 Affected scope

Check the vendor advisory for the affected versions of OneDev is an all-in-one devops platform. In OneDev. Attack surface: io.onedev.commons.utils.TarUtils.

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
Audit SBOM/dependencies for affected components.
```
資産台帳・SBOM・依存マニフェストで OneDev is an all-in-one devops platform. In OneDev を使っているサービスとバージョンを洗い出す。
2
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

References

advisory github.com