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GHSA-7322-jrq4-x5hf
No affected components available
Impact
Users of HMAC-based algorithms (HS256, HS384, and HS512) combined with Lcobucci\JWT\Signer\Key\LocalFileReference as key are having their tokens issued/validated using the file path as hashing key - instead of the contents.
The HMAC hashing functions take any string as input and, since users can issue and validate tokens, people are lead to believe that everything works properly.
Patches
All versions have been patched to always load the file contents, deprecated the Lcobucci\JWT\Signer\Key\LocalFileReference, and suggest Lcobucci\JWT\Signer\Key\InMemory as the alternative.
Workarounds
Use Lcobucci\JWT\Signer\Key\InMemory instead of Lcobucci\JWT\Signer\Key\LocalFileReference to create the instances of your keys:
-use Lcobucci\JWT\Signer\Key\LocalFileReference;
+use Lcobucci\JWT\Signer\Key\InMemory;
-$key = LocalFileReference::file(__DIR__ . '/public-key.pem');
+$key = InMemory::file(__DIR__ . '/public-key.pem');
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. 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 low impact on the confidentiality of the information. There is a low 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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