Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: defer destroy_previous_session() until after NTLM authentication In ntlm_authenticate(), destroy_previous_session() is called using a user pointer resolved from the client-supplied NTLM blob username field before the NTLMv2 response is validated. An authenticated attacker can set the NTLM blob username to match a victim account and set PreviousSessionId to the victim's session ID; destroy_previous_session() destroys the victim's session while ksmbd_decode_ntlmssp_auth_blob() subsequently rejects the request with -EPERM. Move destroy_previous_session() and the prev_id assignment to after ksmbd_decode_ntlmssp_auth_blob() returns success and use sess->user rather than the pre-authentication lookup result. This matches the ordering already used by krb5_authenticate(), where destroy_previous_session() is called only after ksmbd_krb5_authenticate() returns success.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < ab0230257ebdf48b07eaa679a8c92bc842fe3498affectede2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 370b0ec8822b69c9073265e16b7daaa8201c9a4faffectede2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 5c833074b549e5db125436a6f681af682261f785affectede2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 243f1614ef2aca2d62a744575f1c24b07cd42757affectede2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 18705cace0619fd2123737dcd028147774f38181affectede2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 0ff12308c8a6c16ab68f0a487ffa93d69001dc18affectede2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < c74801ee524f477c174a1899782b6c3b6918d407affected
Linux Linux
Default version status: affected
5.15affected0 to < 5.15unaffected5.15.217 to ≤ 5.15.*unaffected6.1.183 to ≤ 6.1.*unaffected6.6.148 to ≤ 6.6.*unaffected6.12.101 to ≤ 6.12.*unaffected6.18.42 to ≤ 6.18.*unaffected7.1.6 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ab0230257ebdf48b07eaa679a8c92bc842fe3498 ↗
- https://git.kernel.org/stable/c/370b0ec8822b69c9073265e16b7daaa8201c9a4f ↗
- https://git.kernel.org/stable/c/5c833074b549e5db125436a6f681af682261f785 ↗
- https://git.kernel.org/stable/c/243f1614ef2aca2d62a744575f1c24b07cd42757 ↗
- https://git.kernel.org/stable/c/18705cace0619fd2123737dcd028147774f38181 ↗
- https://git.kernel.org/stable/c/0ff12308c8a6c16ab68f0a487ffa93d69001dc18 ↗
- https://git.kernel.org/stable/c/c74801ee524f477c174a1899782b6c3b6918d407 ↗