CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the SCTP (Stream Control Transmission Protocol) implementation, allowing expired cookies to be accepted under certain conditions, which could lead to unauthorized association restarts. This flaw can be exploited to bypass security checks, potentially enabling replay attacks and disrupting communication. Organizations using Linux systems that implement SCTP should prioritize addressing this vulnerability to mitigate risks associated with session hijacking and data integrity breaches.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: sctp: reject stale cookies with mismatched verification tags sctp_unpack_cookie() skips cookie expiration checks whenever an association already exists. This is broader than the exception in RFC 9260 Section 5.2.4. For an existing association, Section 5.2.4 permits an expired State Cookie only when both Verification Tags in the cookie match the current association. Otherwise, the packet SHOULD be discarded and a Stale Cookie ERROR MUST be sent. The broad check lets an expired Action A restart cookie reach sctp_sf_do_dupcook_a(). In a runtime test with the default 60 second cookie lifetime, replaying such a cookie after 65 seconds returned a COOKIE-ACK and restarted the association. Check cookie expiration unless both Verification Tags match. This preserves the Action D exception for a lost COOKIE ACK while rejecting expired cookies in all other cases.