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Published: 21 January 2020

All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange. In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a crash there is harmless).



CVSS 3 base score: 6.5


Package Release Status
Launchpad, Ubuntu, Debian
Released (4.11.5,4.10.12)
Ubuntu 21.10 (Impish Indri)
Released (2:4.11.5+dfsg-1ubuntu1)
Ubuntu 21.04 (Hirsute Hippo)
Released (2:4.11.5+dfsg-1ubuntu1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (2:4.11.5+dfsg-1ubuntu1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (2:4.7.6+dfsg~ubuntu-0ubuntu2.15)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (2:4.3.11+dfsg-0ubuntu0.16.04.25)
Ubuntu 14.04 ESM (Trusty Tahr) Needs triage