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Sicherheit: Denial of Service in PAM (Aktualisierung)
Aktuelle Meldungen Distributionen
Name: Denial of Service in PAM (Aktualisierung)
ID: USN-1140-2
Distribution: Ubuntu
Plattformen: Ubuntu 8.04 LTS, Ubuntu 10.04 LTS, Ubuntu 10.10, Ubuntu 11.04
Datum: Mi, 1. Juni 2011, 07:18
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0887
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3316
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3430
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3431
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3435
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3853
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-4706
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-4707
Applikationen: Linux-PAM
Update von: Mehrere Probleme in PAM

Originalnachricht


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==========================================================================
Ubuntu Security Notice USN-1140-2
May 31, 2011

pam regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

The USN-1140-1 PAM update caused cron to stop working.

Software Description:
- pam: Pluggable Authentication Modules

Details:

USN-1140-1 fixed vulnerabilities in PAM. A regression was found that caused
cron to stop working with a "Module is unknown" error. As a result,
systems
configured with automatic updates will not receive updates until cron is
restarted, these updates are installed or the system is rebooted. This
update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Marcus Granado discovered that PAM incorrectly handled configuration files
with non-ASCII usernames. A remote attacker could use this flaw to cause a
denial of service, or possibly obtain login access with a different users
username. This issue only affected Ubuntu 8.04 LTS. (CVE-2009-0887)

It was discovered that the PAM pam_xauth, pam_env and pam_mail modules
incorrectly handled dropping privileges when performing operations. A local
attacker could use this flaw to read certain arbitrary files, and access
other sensitive information. (CVE-2010-3316, CVE-2010-3430, CVE-2010-3431,
CVE-2010-3435)

It was discovered that the PAM pam_namespace module incorrectly cleaned the
environment during execution of the namespace.init script. A local attacker
could use this flaw to possibly gain privileges. (CVE-2010-3853)

It was discovered that the PAM pam_xauth module incorrectly handled certain
failures. A local attacker could use this flaw to delete certain unintended
files. (CVE-2010-4706)

It was discovered that the PAM pam_xauth module incorrectly verified
certain file properties. A local attacker could use this flaw to cause a
denial of service. (CVE-2010-4707)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 11.04:
libpam-modules 1.1.2-2ubuntu8.3
libpam0g 1.1.2-2ubuntu8.3

Ubuntu 10.10:
libpam-modules 1.1.1-4ubuntu2.3
libpam0g 1.1.1-4ubuntu2.3

Ubuntu 10.04 LTS:
libpam-modules 1.1.1-2ubuntu5.3
libpam0g 1.1.1-2ubuntu5.3

Ubuntu 8.04 LTS:
libpam-modules 0.99.7.1-5ubuntu6.4
libpam0g 0.99.7.1-5ubuntu6.4

In general, a standard system update will make all the necessary changes.

References:
https://launchpad.net/bugs/790538

Package Information:
https://launchpad.net/ubuntu/+source/pam/1.1.2-2ubuntu8.3
https://launchpad.net/ubuntu/+source/pam/1.1.1-4ubuntu2.3
https://launchpad.net/ubuntu/+source/pam/1.1.1-2ubuntu5.3
https://launchpad.net/ubuntu/+source/pam/0.99.7.1-5ubuntu6.4



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