CVE-2025-25184: Possible Log Injection in Rack::CommonLogger
First published: Wed Feb 12 2025(Updated: )
## Summary `Rack::CommonLogger` can be exploited by crafting input that includes newline characters to manipulate log entries. The supplied proof-of-concept demonstrates injecting malicious content into logs. ## Details When a user provides the authorization credentials via `Rack::Auth::Basic`, if success, the username will be put in `env['REMOTE_USER']` and later be used by `Rack::CommonLogger` for logging purposes. The issue occurs when a server intentionally or unintentionally allows a user creation with the username contain CRLF and white space characters, or the server just want to log every login attempts. If an attacker enters a username with CRLF character, the logger will log the malicious username with CRLF characters into the logfile. ## Impact Attackers can break log formats or insert fraudulent entries, potentially obscuring real activity or injecting malicious data into log files. ## Mitigation - Update to the latest version of Rack.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Rack CommonLogger | <2.2.11<3.0.12<3.1.11 | |
| rubygems/rack | >=3.1<3.1.11 | 3.1.11 |
| rubygems/rack | >=3.0<3.0.12 | 3.0.12 |
| rubygems/rack | <2.2.11 | 2.2.11 |
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Reference Links
- https://github.com/rack/rack/security/advisories/GHSA-7g2v-jj9q-g3rg
- https://github.com/rack/rack/commit/074ae244430cda05c27ca91cda699709cfb3ad8e
- https://nvd.nist.gov/vuln/detail/CVE-2025-25184
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2025-25184.yml
- https://github.com/advisories/GHSA-7g2v-jj9q-g3rg (Advisory)
Frequently Asked Questions
What is the severity of CVE-2025-25184?
CVE-2025-25184 is classified as a medium severity vulnerability due to its potential for log manipulation.
How do I fix CVE-2025-25184?
To fix CVE-2025-25184, upgrade to Rack versions 2.2.11, 3.0.12, or 3.1.11 or later.
Which versions of Rack are affected by CVE-2025-25184?
CVE-2025-25184 affects versions of Rack prior to 2.2.11, 3.0.12, and 3.1.11.
What type of vulnerability is CVE-2025-25184?
CVE-2025-25184 is a log injection vulnerability that can manipulate log entries.
Is there a proof-of-concept available for CVE-2025-25184?
Yes, a proof-of-concept demonstrating the exploitation of CVE-2025-25184 is available.
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