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GHSA-q7pg-9pr4-mrp2
No affected components available
Summary
HMAC signature comparison is not timing-safe and is vulnerable to timing attacks.
Details
SharedKey::sign() returns a Vec<u8> which has a non-constant-time equality implementation.
Hmac::finalize() returns a constant-time wrapper (CtOutput) which was discarded. Alternatively, Hmac has a constant-time verify() method.
The problem reported here is due to the following lines in SharedKey::sign() of the previous code:
let mut mac = HmacSha256::new_from_slice(key).unwrap();
mac.update(data);
Ok(mac.finalize().into_bytes().to_vec())
and the merged update changes the third line to directly verify with verify_slice.
Impact
Anyone who uses HS256 signature verification is vulnerably to Timing Attack that allows the attacker to forge a signature.
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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