# CVE-2021-43957: Path traversal in Crucible

> Remote attackers can browse local files in the WEB-INF directory due to an IDOR vulnerability and lack of URL decoding.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Mar 2022
- **Updated:** 4 Oct 2024
- **Also known as:** GHSA-wg3j-ppp5-jg9q

## What is CVE-2021-43957?

CVE-2021-43957 is a high-severity path traversal vulnerability in Atlassian Crucible, published on 16 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Affected versions of Atlassian Fisheye & Crucible allowed remote attackers to browse local files via an Insecure Direct Object References (IDOR) vulnerability in the WEB-INF directory and bypass the fix for CVE-2020-29446 due to a lack of url decoding. The affected versions are before version 4.8.9.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2021-43957?

It affects 2 products.


Products: Atlassian Crucible, Atlassian Fisheye.

## How do I fix CVE-2021-43957?

No fix has been published for CVE-2021-43957 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43957 being exploited?

There is no known exploitation of CVE-2021-43957 in the wild and no public exploit code.

## Other vulnerabilities in Atlassian Crucible

- [CVE-2021-43958](https://insights.sbomify.com/CVE-2021-43958/): Security feature bypass in Crucible (critical 9.8)
- [CVE-2017-16861](https://insights.sbomify.com/CVE-2017-16861/): Code injection in Fisheye and Crucible (critical 9.8)
- [CVE-2017-14591](https://insights.sbomify.com/CVE-2017-14591/): Command injection in Fisheye and Crucible (critical 9.0)
- [CVE-2020-4018](https://insights.sbomify.com/CVE-2020-4018/): Cross-site request forgery in Crucible (high 8.8)
- [CVE-2018-13399](https://insights.sbomify.com/CVE-2018-13399/): Privilege escalation in Fisheye and Crucible (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43957 and fix it if it is affected.

What it is: CVE-2021-43957 is a high-severity path traversal vulnerability in Atlassian Crucible, published on 16 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-43957 in the wild and no public exploit code.

Affected product: Atlassian Crucible. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-43957/ (Markdown: https://insights.sbomify.com/CVE-2021-43957/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43957
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43957
- OSV: https://osv.dev/vulnerability/CVE-2021-43957

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43957/
Summaries are generated and may contain mistakes; the official description above is the record.