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CVE-2018-16841

Status Candidate

Overview

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.

Related Files

Slackware Security Advisory - samba Updates
Posted Nov 30, 2018
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New samba packages are available for Slackware 14.0, 14.1, 14.2, and -current to fix security issues.

tags | advisory
systems | linux, slackware
advisories | CVE-2018-14629, CVE-2018-16841, CVE-2018-16851, CVE-2018-16852, CVE-2018-16853, CVE-2018-16857
MD5 | 22cf0b1d2a8e1c02d18427b3e8e5a3f6
Debian Security Advisory 4345-1
Posted Nov 28, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4345-1 - Several vulnerabilities have been discovered in Samba, a SMB/CIFS file, print, and login server for Unix.

tags | advisory, vulnerability
systems | linux, unix, debian
advisories | CVE-2018-14629, CVE-2018-16841, CVE-2018-16851
MD5 | f3606a59eb6ee66c892dcf8acffd50a7
Ubuntu Security Notice USN-3827-2
Posted Nov 28, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3827-2 - USN-3827-1 fixed a vulnerability in samba. This update provides the corresponding update for Ubuntu 12.04 ESM. Florian Stuelpner discovered that Samba incorrectly handled CNAME records. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2018-14629, CVE-2018-16841, CVE-2018-16851
MD5 | 590885474e10b4feca61644f7fdbb68a
Ubuntu Security Notice USN-3827-1
Posted Nov 27, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3827-1 - Florian Stuelpner discovered that Samba incorrectly handled CNAME records. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service. Alex MacCuish discovered that Samba incorrectly handled memory when configured to accept smart-card authentication. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2018-14629, CVE-2018-16841, CVE-2018-16851
MD5 | 8e7c628327d7df9c22630a679f5edc93
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