ctdb: Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service
CVE-2018-16841 is fixed in 17 products on 1 platform, first by ctdb 2:4.7.6+dfsg~ubuntu-0ubuntu2.5, released November 26, 2018. It is not reported as exploited. Patch Radar priority: Routine.
Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ctdb · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | ctdb 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| libnss-winbind · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | libnss-winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| libpam-winbind · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | libpam-winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| libparse-pidl-perl · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | libparse-pidl-perl 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| libsmbclient · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | libsmbclient 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| libwbclient0 · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | libwbclient0 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| python-samba · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | python-samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| registry-tools · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | registry-tools 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| samba · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| samba-common · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | samba-common 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| samba-common-bin · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | samba-common-bin 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| samba-dsdb-modules · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | samba-dsdb-modules 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| samba-libs · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | samba-libs 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| samba-testsuite · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | samba-testsuite 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| samba-vfs-modules · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | samba-vfs-modules 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| smbclient · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | smbclient 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
| winbind · Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | Nov 26, 2018 |
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