Detections
Analytics
CentOS 3 / 4 : krb5 (CESA-2007:0095)
high Nessus Plugin ID 24919
Synopsis
The remote CentOS host is missing one or more security updates.Description
Updated krb5 packages that fix a number of issues are now available.This update has been rated as having critical security impact by the Red Hat Security Response Team.
Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC.
A flaw was found in the username handling of the MIT krb5 telnet daemon (telnetd). A remote attacker who can access the telnet port of a target machine could log in as root without requiring a password.
(CVE-2007-0956)
Note that the krb5 telnet daemon is not enabled by default in any version of Red Hat Enterprise Linux. In addition, the default firewall rules block remote access to the telnet port. This flaw does not affect the telnet daemon distributed in the telnet-server package.
For users who have enabled the krb5 telnet daemon and have it accessible remotely, this update should be applied immediately.
Whilst we are not aware at this time that the flaw is being actively exploited, we have confirmed that the flaw is very easily exploitable.
This update also fixes two additional security issues :
Buffer overflows were found which affect the Kerberos KDC and the kadmin server daemon. A remote attacker who can access the KDC could exploit this bug to run arbitrary code with the privileges of the KDC or kadmin server processes. (CVE-2007-0957)
A double-free flaw was found in the GSSAPI library used by the kadmin server daemon. Red Hat Enterprise Linux 4 and 5 contain checks within glibc that detect double-free flaws. Therefore, on Red Hat Enterprise Linux 4 and 5 successful exploitation of this issue can only lead to a denial of service. Applications which use this library in earlier releases of Red Hat Enterprise Linux may also be affected.
(CVE-2007-1216)
All users are advised to update to these erratum packages which contain a backported fix to correct these issues.
Red Hat would like to thank MIT and iDefense for reporting these vulnerabilities.
Solution
Update the affected krb5 packages.See Also
http://www.nessus.org/u?5aa5d1e6
http://www.nessus.org/u?e4656c7f
http://www.nessus.org/u?84f46e52
http://www.nessus.org/u?c04ec56e
Plugin Details
Severity: High
ID: 24919
File Name: centos_RHSA-2007-0095.nasl
Version: 1.22
Type: local
Agent: unix
Family: CentOS Local Security Checks
Published: 4/5/2007
Updated: 1/4/2021
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.4
CVSS v2
Risk Factor: High
Base Score: 9
Temporal Score: 7.4
Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C
Vulnerability Information
CPE: cpe:/o:centos:centos:3, p-cpe:/a:centos:centos:krb5-workstation, p-cpe:/a:centos:centos:krb5-devel, p-cpe:/a:centos:centos:krb5-libs, p-cpe:/a:centos:centos:krb5-server, cpe:/o:centos:centos:4
Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 4/3/2007
Vulnerability Publication Date: 4/5/2007
Exploitable With
CANVAS (D2ExploitPack)