CVE-2018-16841: Double Free
First published: Tue Nov 27 2018(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Samba Samba | >=4.3.0<4.7.12 | |
| Samba Samba | >=4.8.0<4.8.7 | |
| Samba Samba | >=4.9.0<4.9.3 | |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =18.10 | |
| Debian Debian Linux | =9.0 | |
| ubuntu/samba | <2:4.7.6+dfsg~ubuntu-0ubuntu2.5 | 2:4.7.6+dfsg~ubuntu-0ubuntu2.5 |
| ubuntu/samba | <2:4.8.4+dfsg-2ubuntu2.1 | 2:4.8.4+dfsg-2ubuntu2.1 |
| ubuntu/samba | <2:4.3.11+dfsg-0ubuntu0.14.04.19 | 2:4.3.11+dfsg-0ubuntu0.14.04.19 |
| ubuntu/samba | <4.7.12<4.8.7<4.9.3 | 4.7.12 4.8.7 4.9.3 |
| ubuntu/samba | <2:4.3.11+dfsg-0ubuntu0.16.04.18 | 2:4.3.11+dfsg-0ubuntu0.16.04.18 |
| debian/samba | 2:4.13.13+dfsg-1~deb11u6 2:4.17.12+dfsg-0+deb12u1 2:4.21.0~rc1+really4.20.4+dfsg-1 |
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Reference Links
- http://www.securityfocus.com/bid/106023
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841
- https://security.gentoo.org/glsa/202003-52
- https://security.netapp.com/advisory/ntap-20181127-0001/
- https://usn.ubuntu.com/3827-1/
- https://usn.ubuntu.com/3827-2/
- https://www.debian.org/security/2018/dsa-4345
- https://www.samba.org/samba/security/CVE-2018-16841.html
- https://launchpad.net/bugs/cve/CVE-2018-16841
- https://security-tracker.debian.org/tracker/CVE-2018-16841
- https://ubuntu.com/security/notices/USN-3827-1
- https://ubuntu.com/security/notices/USN-3827-2
- https://www.cve.org/CVERecord?id=CVE-2018-16841
- https://nvd.nist.gov/vuln/detail/CVE-2018-16841
- https://ubuntu.com/security/CVE-2018-16841
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