Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before ab0230257ebdf48b07eaa679a8c92bc842fe3498; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 370b0ec8822b69c9073265e16b7daaa8201c9a4f; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 5c833074b549e5db125436a6f681af682261f785; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 243f1614ef2aca2d62a744575f1c24b07cd42757; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 18705cace0619fd2123737dcd028147774f38181; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 0ff12308c8a6c16ab68f0a487ffa93d69001dc18; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before c74801ee524f477c174a1899782b6c3b6918d407 |
| Linux / Linux | affected 5.15; unaffected 0 before 5.15; unaffected 5.15.217 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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