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GHSA-9xww-74xv-gjfp
org.http4s/http4s-ember-core_3org.http4s/http4s-ember-core_2.13org.http4s/http4s-ember-core_3The DigestAuth replay defence stores lastNc + 1 rather than the nonce-count (nc) value it just accepted. When a legitimate client sends non-contiguous nc values (parallel or retried requests, as browsers do), the server's counter lags behind the highest nc seen, and a captured Authorization header can be replayed multiple times.
Impact
A passive observer can turn one captured Digest-authenticated request into several replayed authenticated (state-changing) requests, defeating the core replay protection Digest provides over Basic.
Preconditions
- Application uses
DigestAuth. - Attacker can passively observe at least one legitimate digest request.
- Legitimate client emits an
ncmore than one greater than the last, for instance from a parallel or retried request.
Workarounds
- Deploy over TLS so requests cannot be captured.
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The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. 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 integrity of the data.
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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