Updated pam packages that fix three security issues are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Pluggable Authentication Modules (PAM) provide a system whereby administrators can set up authentication policies without having to recompile programs that handle authentication.

It was discovered that the pam_namespace module executed the external script namespace.init with an unchanged environment inherited from an application calling PAM. In cases where such an environment was untrusted (for example, when pam_namespace was configured for setuid applications such as su or sudo), a local, unprivileged user could possibly use this flaw to escalate their privileges. (CVE-2010-3853)

It was discovered that the pam_env and pam_mail modules used root privileges while accessing user's files. A local, unprivileged user could use this flaw to obtain information, from the lines that have the KEY=VALUE format expected by pam_env, from an arbitrary file.
Also, in certain configurations, a local, unprivileged user using a service for which the pam_mail module was configured for, could use this flaw to obtain limited information about files or directories that they do not have access to. (CVE-2010-3435)

Note: As part of the fix for CVE-2010-3435, this update changes the default value of pam_env's configuration option user_readenv to 0, causing the module to not read user's ~/.pam_environment configuration file by default, as reading it may introduce unexpected changes to the environment of the service using PAM, or PAM modules consulted after pam_env.

It was discovered that the pam_xauth module did not verify the return values of the setuid() and setgid() system calls. A local, unprivileged user could use this flaw to execute the xauth command with root privileges and make it read an arbitrary input file.
(CVE-2010-3316)

Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for reporting the CVE-2010-3435 issue.

All pam users should upgrade to these updated packages, which contain backported patches to correct these issues.

The remote host is affected by the vulnerability described in GLSA-201206-31 (Linux-PAM: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Linux-PAM. Please       review the CVE identifiers referenced below for details.
  Impact :

    A local attacker could use specially crafted files to cause a buffer       overflow, possibly resulting in privilege escalation or Denial of       Service. Furthermore, a local attacker could execute specially crafted       programs or symlink attacks, possibly resulting in data loss or       disclosure of sensitive information.
  Workaround :

    There is no known workaround at this time.

Multiple vulnerabilities were discovered and corrected in pam :

The pam_xauth module did not verify the return values of the setuid() and setgid() system calls. A local, unprivileged user could use this flaw to execute the xauth command with root privileges and make it read an arbitrary input file (CVE-2010-3316).

The pam_mail module used root privileges while accessing users' files.
In certain configurations, a local, unprivileged user could use this flaw to obtain limited information about files or directories that they do not have access to (CVE-2010-3435).

The pam_namespace module executed the external script namespace.init with an unchanged environment inherited from an application calling PAM. In cases where such an environment was untrusted (for example, when pam_namespace was configured for setuid applications such as su or sudo), a local, unprivileged user could possibly use this flaw to escalate their privileges (CVE-2010-3853).

Packages for 2009.0 are provided as of the Extended Maintenance Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&amp;products_id=4 90

The updated packages have been patched to correct these issues.

This update fixes moderate vulnerabilities in pam_env, pam_namespace, pam_mail, and pam_xauth modules. Default configurations (or configurations generated by authconfig) are not affected by the pam_mail and pam_namespace vulnerabilities.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Updated pam packages that fix three security issues are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Pluggable Authentication Modules (PAM) provide a system whereby administrators can set up authentication policies without having to recompile programs that handle authentication.

It was discovered that the pam_namespace module executed the external script namespace.init with an unchanged environment inherited from an application calling PAM. In cases where such an environment was untrusted (for example, when pam_namespace was configured for setuid applications such as su or sudo), a local, unprivileged user could possibly use this flaw to escalate their privileges. (CVE-2010-3853)

It was discovered that the pam_mail module used root privileges while accessing users' files. In certain configurations, a local, unprivileged user could use this flaw to obtain limited information about files or directories that they do not have access to.
(CVE-2010-3435)

It was discovered that the pam_xauth module did not verify the return values of the setuid() and setgid() system calls. A local, unprivileged user could use this flaw to execute the xauth command with root privileges and make it read an arbitrary input file.
(CVE-2010-3316)

Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for reporting the CVE-2010-3435 issue.

All pam users should upgrade to these updated packages, which contain backported patches to correct these issues.

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2010-0891 advisory.

    - fix insecure dropping of priviledges in pam_xauth, pam_env,       and pam_mail - CVE-2010-3316 (#637898), CVE-2010-3435 (#641335)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

a. Service Location Protocol daemon DoS

   This patch fixes a denial-of-service vulnerability in    the Service Location Protocol daemon (SLPD). Exploitation of this    vulnerability could cause SLPD to consume significant CPU    resources.

   VMware would like to thank Nicolas Gregoire and US CERT for    reporting this issue to us.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2010-3609 to this issue.

b. Service Console update for bind

   This patch updates the bind-libs and bind-utils RPMs to version    9.3.6-4.P1.el5_5.3, which resolves multiple security issues.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2010-3613, CVE-2010-3614, and    CVE-2010-3762 to these issues.

c. Service Console update for pam

   This patch updates the pam RPM to pam_0.99.6.2-3.27.5437.vmw,    which resolves multiple security issues with PAM modules.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2010-3316, CVE-2010-3435, and    CVE-2010-3853 to these issues.

d. Service Console update for rpm, rpm-libs, rpm-python, and popt

   This patch updates rpm, rpm-libs, and rpm-python RPMs to    4.4.2.3-20.el5_5.1, and popt to version 1.10.2.3-20.el5_5.1,    which resolves a security issue.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2010-2059 to this issue.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
50644	RHEL 6 : pam (RHSA-2010:0891)	Nessus	Red Hat Local Security Checks	2010/11/18	2021/1/14	high
59704	GLSA-201206-31 : Linux-PAM: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2012/6/26	2021/1/6	high
50472	Mandriva Linux Security Advisory : pam (MDVSA-2010:220)	Nessus	Mandriva Local Security Checks	2010/11/4	2021/1/6	medium
50626	Fedora 12 : pam-1.1.1-6.fc12 (2010-17133)	Nessus	Fedora Local Security Checks	2010/11/18	2021/1/11	medium
55102	Ubuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 : pam vulnerabilities (USN-1140-1)	Nessus	Ubuntu Local Security Checks	2011/6/13	2019/9/19	medium
50804	CentOS 5 : pam (CESA-2010:0819)	Nessus	CentOS Local Security Checks	2010/11/24	2021/1/4	medium
50447	RHEL 5 : pam (RHSA-2010:0819)	Nessus	Red Hat Local Security Checks	2010/11/2	2021/1/14	medium
68144	Oracle Linux 6 : pam (ELSA-2010-0891)	Nessus	Oracle Linux Local Security Checks	2013/7/12	2024/10/22	high
52582	VMSA-2011-0004 : VMware ESX/ESXi SLPD denial of service vulnerability and ESX third-party updates for Service Console packages bind, pam, and rpm.	Nessus	VMware ESX Local Security Checks	2011/3/8	2021/1/6	high

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