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Scientific Linux Security Update : krb5 on SL5.x i386/x86_64 (20140916)
high Nessus Plugin ID 78418
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request. (CVE-2013-1418, CVE-2013-6800)A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO acceptor for continuation tokens. A remote, unauthenticated attacker could use this flaw to crash a GSSAPI-enabled server application.
(CVE-2014-4344)
A buffer over-read flaw was found in the way MIT Kerberos handled certain requests. A man-in-the-middle attacker with a valid Kerberos ticket who is able to inject packets into a client or server application's GSSAPI session could use this flaw to crash the application. (CVE-2014-4341)
This update also fixes the following bugs :
- Prior to this update, the libkrb5 library occasionally attempted to free already freed memory when encrypting credentials. As a consequence, the calling process terminated unexpectedly with a segmentation fault. With this update, libkrb5 frees memory correctly, which allows the credentials to be encrypted appropriately and thus prevents the mentioned crash.
- Previously, when the krb5 client library was waiting for a response from a server, the timeout variable in certain cases became a negative number. Consequently, the client could enter a loop while checking for responses. With this update, the client logic has been modified and the described error no longer occurs.
After installing the updated packages, the krb5kdc daemon will be restarted automatically.
Solution
Update the affected packages.See Also
Plugin Details
Severity: High
ID: 78418
File Name: sl_20140916_krb5_on_SL5_x.nasl
Version: 1.8
Type: local
Agent: unix
Published: 10/14/2014
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
CVSS v2
Risk Factor: High
Base Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
Vulnerability Information
CPE: p-cpe:/a:fermilab:scientific_linux:krb5-debuginfo, p-cpe:/a:fermilab:scientific_linux:krb5-devel, p-cpe:/a:fermilab:scientific_linux:krb5-libs, p-cpe:/a:fermilab:scientific_linux:krb5-server, p-cpe:/a:fermilab:scientific_linux:krb5-server-ldap, p-cpe:/a:fermilab:scientific_linux:krb5-workstation, x-cpe:/o:fermilab:scientific_linux
Required KB Items: Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list, Host/local_checks_enabled
Patch Publication Date: 9/16/2014
Vulnerability Publication Date: 11/18/2013
Reference Information
CVE: CVE-2013-1418, CVE-2013-6800, CVE-2014-4341, CVE-2014-4344