CVE-2018-16841

Summary

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.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://www.samba.org/samba/security/CVE-2018-16841.html ↗

Additional information

• NVD record
• https://www.samba.org/samba/security/CVE-2018-16841.htmlPatch
• http://www.securityfocus.com/bid/106023Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841Advisory
• https://security.gentoo.org/glsa/202003-52Advisory
• https://security.netapp.com/advisory/ntap-20181127-0001/Advisory
• https://usn.ubuntu.com/3827-1/Advisory
• https://usn.ubuntu.com/3827-2/Advisory
• https://www.debian.org/security/2018/dsa-4345Advisory