Scientific Linux Security Update : pam_krb5 on SL5.x i386/x86_64

Medium Nessus Plugin ID 60772

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VPR Score: 3.7


The remote Scientific Linux host is missing a security update.


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.

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.


Update the affected pam_krb5 package.

See Also

Plugin Details

Severity: Medium

ID: 60772

File Name: sl_20100330_pam_krb5_on_SL5_x.nasl

Version: 1.5

Type: local

Agent: unix

Published: 2012/08/01

Updated: 2021/01/14

Dependencies: 12634

Risk Information

Risk Factor: Medium

VPR Score: 3.7

CVSS v2.0

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2010/03/30

Reference Information

CVE: CVE-2009-1384

CWE: 287