Executive Summary



This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Summary
Title Linux-PAM: Privilege escalation
Informations
Name GLSA-200909-01 First vendor Publication 2009-09-07
Vendor Gentoo Last vendor Modification 2009-09-07
Severity (Vendor) Normal Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:M/Au:S/C:C/I:C/A:C)
Cvss Base Score 6.6 Attack Range Local
Cvss Impact Score 10 Attack Complexity Medium
Cvss Expoit Score 2.7 Authentication Requires single instance
Calculate full CVSS 2.0 Vectors scores

Detail

Synopsis

An error in the handling of user names of Linux-PAM might allow remote attackers to cause a Denial of Service or escalate privileges.

Background

Linux-PAM (Pluggable Authentication Modules) is an architecture allowing the separation of the development of privilege granting software from the development of secure and appropriate authentication schemes.

Description

Marcus Granado repoted that Linux-PAM does not properly handle user names that contain Unicode characters. This is related to integer signedness errors in the pam_StrTok() function in libpam/pam_misc.c.

Impact

A remote attacker could exploit this vulnerability to cause a Denial of Service. A remote authenticated attacker could exploit this vulnerability to log in to a system with the account of a user that has a similar user name, but with non-ASCII characters.

Workaround

There is no known workaround at this time.

Resolution

All Linux-PAM users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose =sys-libs/pam-1.0.4

References

[ 1 ] CVE-2009-0887 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0887

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200909-01.xml

Original Source

Url : http://security.gentoo.org/glsa/glsa-200909-01.xml

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-189 Numeric Errors (CWE/SANS Top 25)

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 21

OpenVAS Exploits

Date Description
2011-06-06 Name : Ubuntu Update for pam USN-1140-1
File : nvt/gb_ubuntu_USN_1140_1.nasl
2011-06-06 Name : Ubuntu Update for pam USN-1140-2
File : nvt/gb_ubuntu_USN_1140_2.nasl
2009-09-09 Name : Gentoo Security Advisory GLSA 200909-01 (pam)
File : nvt/glsa_200909_01.nasl
2009-04-15 Name : Fedora Core 10 FEDORA-2009-3204 (pam)
File : nvt/fcore_2009_3204.nasl
2009-04-15 Name : Fedora Core 9 FEDORA-2009-3231 (pam)
File : nvt/fcore_2009_3231.nasl
2009-03-31 Name : Mandrake Security Advisory MDVSA-2009:077 (pam)
File : nvt/mdksa_2009_077.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
53112 Linux-PAM (pam) libpam/pam_misc.c _pam_StrTok Function Integer Signedness Wea...

Nessus® Vulnerability Scanner

Date Description
2011-06-13 Name : The remote Ubuntu host is missing a security-related patch.
File : ubuntu_USN-1140-1.nasl - Type : ACT_GATHER_INFO
2011-06-13 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-1140-2.nasl - Type : ACT_GATHER_INFO
2009-09-08 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-200909-01.nasl - Type : ACT_GATHER_INFO
2009-04-23 Name : The remote Fedora host is missing a security update.
File : fedora_2009-3204.nasl - Type : ACT_GATHER_INFO
2009-04-23 Name : The remote Mandriva Linux host is missing one or more security updates.
File : mandriva_MDVSA-2009-077.nasl - Type : ACT_GATHER_INFO
2009-04-15 Name : The remote Fedora host is missing a security update.
File : fedora_2009-3231.nasl - Type : ACT_GATHER_INFO

Alert History

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0
Date Informations
2014-02-17 11:36:40
  • Multiple Updates