Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Samba | Samba | >= 4.3.0, < 4.7.12 |
| Canonical | Ubuntu Linux | 12.04 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/106023Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841Issue TrackingThird Party Advisory
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
- https://usn.ubuntu.com/3827-1/Third Party Advisory
- https://usn.ubuntu.com/3827-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4345Third Party Advisory
- https://www.samba.org/samba/security/CVE-2018-16841.htmlPatchVendor Advisory
- http://www.securityfocus.com/bid/106023Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841Issue TrackingThird Party Advisory
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
- https://usn.ubuntu.com/3827-1/Third Party Advisory
- https://usn.ubuntu.com/3827-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4345Third Party Advisory
FAQ
What is CVE-2018-16841?
CVE-2018-16841 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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() twi...
How severe is CVE-2018-16841?
CVE-2018-16841 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-16841?
Check the references section above for vendor advisories and patch information. Affected products include: Samba Samba, Canonical Ubuntu Linux, Debian Debian Linux.