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GHSA-fm4g-76c9-7w69
org.http4s/http4s-ember-server_2.13org.http4s/http4s-ember-server_2.12org.http4s/http4s-ember-server_2.13The DigestAuth server middleware's stale-nonce cleanup uses an inverted comparison: it removes fresh nonces and stops at the first stale one. Because a new nonce is created for every unauthenticated challenge, an attacker can drive the nonce map to grow without bound until the JVM runs out of heap.
Impact
Unauthenticated remote denial of service (gradual heap exhaustion / OOM) against any service using DigestAuth. The leak is persistent.
Preconditions
- Application uses
DigestAuthon at least one route.
Workarounds
- Front the DigestAuth protected routes with a rate limiter to slow the leak.
- Restart periodically.
Fixes
- The eviction logic is corrected.
- A max cache size of 1000000 is imposed to protected against a burst between evictions. This limit is not yet configurable.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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