# CVE-2021-21352: Predictable tokens used for password resets

> Predictable password reset tokens allow attackers to guess tokens and take over user accounts, including administrators, in Anuko Time Tracker.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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:** 3 Mar 2021
- **Updated:** 3 Aug 2024

## What is CVE-2021-21352?

CVE-2021-21352 is a medium-severity vulnerability in anuko timetracker, published on 3 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Anuko Time Tracker is an open source, web-based time tracking application written in PHP. In TimeTracker before version 1.19.24.5415 tokens used in password reset feature in Time Tracker are based on system time and, therefore, are predictable. This opens a window for brute force attacks to guess user tokens and, once successful, change user passwords, including that of a system administrator. This vulnerability is pathced in version 1.19.24.5415 (started to use more secure tokens) with an additional improvement in 1.19.24.5416 (limited an available window for brute force token guessing).

Weakness: CWE-330 (Use of Insufficiently Random Values)

## Which versions are affected by CVE-2021-21352?

It affects 1 product.


Products: Anuko Time Tracker.

## How do I fix CVE-2021-21352?

No fix has been published for CVE-2021-21352 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21352 being exploited?

There is no known exploitation of CVE-2021-21352 in the wild and no public exploit code.

## Other vulnerabilities in anuko timetracker

- [CVE-2020-27422](https://insights.sbomify.com/CVE-2020-27422/): Business logic in n/a (critical 9.8)
- [CVE-2023-32306](https://insights.sbomify.com/CVE-2023-32306/): Time Tracker has Blind SQL Injection Vulnerability in Reports (high 8.8)
- [CVE-2020-15255](https://insights.sbomify.com/CVE-2020-15255/): CSV injection in Anuko Time Tracker (high 8.7)
- [CVE-2023-32308](https://insights.sbomify.com/CVE-2023-32308/): SQL Injection Vulnerability in anuko timetracker (high 8.2)
- [CVE-2021-43851](https://insights.sbomify.com/CVE-2021-43851/): SQL injection vulnerability in anuko timetracker (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21352 and fix it if it is affected.

What it is: CVE-2021-21352 is a medium-severity vulnerability in anuko timetracker, published on 3 Mar 2021. 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-2021-21352 in the wild and no public exploit code.

Affected product: anuko timetracker. 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-2021-21352/ (Markdown: https://insights.sbomify.com/CVE-2021-21352/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21352
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21352
- OSV: https://osv.dev/vulnerability/CVE-2021-21352

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21352/
Summaries are generated and may contain mistakes; the official description above is the record.