Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ksmbd: do not expire session on binding failure When a multichannel session binding request fails (e.g. wrong password), the error path unconditionally sets sess->state = SMB2_SESSION_EXPIRED. However, during binding, sess points to the target session looked up via ksmbd_session_lookup_slowpath() -- which belongs to another connection's user. This allows a remote attacker to invalidate any active session by simply sending a binding request with a wrong password (DoS). Fix this by skipping session expiration when the failed request was a binding attempt, since the session does not belong to the current connection. The reference taken by ksmbd_session_lookup_slowpath() is still correctly released via ksmbd_user_session_put().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f5a544e3bab78142207e0242d22442db85ba1eff before 4642ea35c03cf3d3558c009df4757cdb7af3f82d; affected f5a544e3bab78142207e0242d22442db85ba1eff before f5300690c23c5ac860499bb37dbc09cf43fd62e6; affected f5a544e3bab78142207e0242d22442db85ba1eff before 6fafc4c4238e538969f1375f9ecdc6587c53f1cc; affected f5a544e3bab78142207e0242d22442db85ba1eff before 1d1888b4a7aec518b707f6eca0bf08992c0e8da3; affected f5a544e3bab78142207e0242d22442db85ba1eff before a897064a457056acb976e20e3007cdf553de340f; affected f5a544e3bab78142207e0242d22442db85ba1eff before e0e5edc81b241c70355217de7e120c97c3429deb; affected f5a544e3bab78142207e0242d22442db85ba1eff before 9bbb19d21ded7d78645506f20d8c44895e3d0fb9 |
| Linux / Linux | affected 5.15; unaffected 0 before 5.15; unaffected 5.15.209 through 5.15.*; unaffected 6.1.168 through 6.1.*; unaffected 6.6.131 through 6.6.*; unaffected 6.12.80 through 6.12.*; unaffected 6.18.21 through 6.18.*; unaffected 6.19.11 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4642ea35c03cf3d3558c009df4757cdb7af3f82d
- https://git.kernel.org/stable/c/f5300690c23c5ac860499bb37dbc09cf43fd62e6
- https://git.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1cc
- https://git.kernel.org/stable/c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3
- https://git.kernel.org/stable/c/a897064a457056acb976e20e3007cdf553de340f
- https://git.kernel.org/stable/c/e0e5edc81b241c70355217de7e120c97c3429deb
- https://git.kernel.org/stable/c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9