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[USN-1140-2] PAM regression

Posted on 31 May 2011
Ubuntu Security

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

pam regression
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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=
=20
cron to stop working with a "Module is unknown" error. As a result, systems=
=20
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)
=20
It was discovered that the PAM pam_xauth, pam_env and pam_mail modules
incorrectly handled dropping privileges when performing operations. A loca=
l
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)
=20
It was discovered that the PAM pam_namespace module incorrectly cleaned th=
e
environment during execution of the namespace.init script. A local attacke=
r
could use this flaw to possibly gain privileges. (CVE-2010-3853)
=20
It was discovered that the PAM pam_xauth module incorrectly handled certai=
n
failures. A local attacker could use this flaw to delete certain unintende=
d
files. (CVE-2010-4706)
=20
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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