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RHEL 5 : pam_krb5 (RHSA-2010:0258)
medium Nessus Plugin ID 46287
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Synopsis
The remote Red Hat host is missing a security update.Description
Updated pam_krb5 packages that fix one security issue and various bugs are now available for Red Hat Enterprise Linux 5.The Red Hat Security Response Team has rated this update as having low security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
The pam_krb5 module allows Pluggable Authentication Modules (PAM) aware applications to use Kerberos to verify user identities by obtaining user credentials at log in time.
A flaw was found in pam_krb5. In some non-default configurations (specifically, those where pam_krb5 would be the first module to prompt for a password), the text of the password prompt varied based on whether or not the username provided was a username known to the system. A remote attacker could use this flaw to recognize valid usernames, which would aid a dictionary-based password guess attack.
(CVE-2009-1384)
This update also fixes the following bugs :
* certain applications which do not properly implement PAM conversations may fail to authenticate users whose passwords have expired and must be changed, or may succeed without forcing the user's password to be changed. This bug is triggered by a previously-applied fix to pam_krb5 which makes it comply more closely to PAM specifications. If an application misbehaves, enabling the 'chpw_prompt' option for its service should restore the old behavior.
(BZ#509092)
* pam_krb5 does not allow the user to change an expired password in cases where the Key Distribution Center (KDC) is configured to refuse attempts to obtain forwardable password-changing credentials. This update fixes this issue. (BZ#489015)
* failure to verify TGT because of wrong keytab handling. (BZ#450776)
Users of pam_krb5 are advised to upgrade to these updated packages, which resolve these issues.
Solution
Update the affected pam_krb5 package.See Also
Plugin Details
Severity: Medium
ID: 46287
File Name: redhat-RHSA-2010-0258.nasl
Version: 1.19
Type: local
Agent: unix
Family: Red Hat Local Security Checks
Published: 5/11/2010
Updated: 1/14/2021
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 1.4
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 4.1
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
Vulnerability Information
CPE: p-cpe:/a:redhat:enterprise_linux:pam_krb5, cpe:/o:redhat:enterprise_linux:5
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 3/30/2010
Vulnerability Publication Date: 5/28/2009
Reference Information
CVE: CVE-2009-1384
BID: 35112