CVE-2025-24369: Anubis has a bot protection bypass when a sophisticated attacker asks to pass a challenge of difficulty 0
First published: Mon Jan 27 2025(Updated: )
Anubis is a tool that allows administrators to protect bots against AI scrapers through bot-checking heuristics and a proof-of-work challenge to discourage scraping from multiple IP addresses. Anubis allows attackers to bypass the bot protection by requesting a challenge, formulates any nonce (such as 42069), and then passes the challenge with difficulty zero. Commit e09d0226a628f04b1d80fd83bee777894a45cd02 fixes this behavior by not using a client-specified difficulty value.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GNU Anubis | =e09d0226a628f04b1d80fd83bee777894a45cd02 |
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Reference Links
- collector/mitre-cve
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- collector/epss-latest
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- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- vendor/anubis
- canonical/gnu anubis