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Scientific Linux Security Update : krb5 on SL7.x x86_64 (20151119)
medium Nessus Plugin ID 87560
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
It was found that the krb5_read_message() function of MIT Kerberos did not correctly sanitize input, and could create invalid krb5_data objects. A remote, unauthenticated attacker could use this flaw to crash a Kerberos child process via a specially crafted request.(CVE-2014-5355)
A flaw was found in the OTP kdcpreauth module of MIT kerberos. An unauthenticated remote attacker could use this flaw to bypass the requires_preauth flag on a client principal and obtain a ciphertext encrypted in the principal's long-term key. This ciphertext could be used to conduct an off-line dictionary attack against the user's password. (CVE-2015-2694)
The krb5 packages have been upgraded to upstream version 1.13.2, which provides a number of bug fixes and enhancements over the previous version.
Notably, this update fixes the following bugs :
- Previously, the RADIUS support (libkrad) in krb5 was sending krb5 authentication for Transmission Control Protocol (TCP) transports multiple times, accidentally using a code path intended to be used only for unreliable transport types, for example User Datagram Protocol (UDP) transports. A patch that fixes the problem by disabling manual retries for reliable transports, such as TCP, has been applied, and the correct code path is now used in this situation.
- Attempts to use Kerberos single sign-on (SSO) to access SAP NetWeaver systems sometimes failed. The SAP NetWeaver developer trace displayed the following error message :
No credentials were supplied, or the credentials were unavailable or inaccessible Unable to establish the security context
Querying SSO credential lifetime has been modified to trigger credential acquisition, thus preventing the error from occurring. Now, the user can successfully use Kerberos SSO for accessing SAP NetWeaver systems.
Solution
Update the affected packages.See Also
Plugin Details
Severity: Medium
ID: 87560
File Name: sl_20151119_krb5_on_SL7_x.nasl
Version: 2.6
Type: local
Agent: unix
Published: 12/22/2015
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
CVSS v2
Risk Factor: Medium
Base Score: 5.8
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N
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-pkinit, 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/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Patch Publication Date: 11/19/2015
Vulnerability Publication Date: 2/20/2015
Reference Information
CVE: CVE-2014-5355, CVE-2015-2694