Updated pam packages that fix two security issues, several bugs, and add various enhancements 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 to handle authentication.

A stack-based buffer overflow flaw was found in the way the pam_env module parsed users' '~/.pam_environment' files. If an application's PAM configuration contained 'user_readenv=1' (this is not the default), a local attacker could use this flaw to crash the application or, possibly, escalate their privileges. (CVE-2011-3148)

A denial of service flaw was found in the way the pam_env module expanded certain environment variables. If an application's PAM configuration contained 'user_readenv=1' (this is not the default), a local attacker could use this flaw to cause the application to enter an infinite loop. (CVE-2011-3149)

Red Hat would like to thank Kees Cook of the Google ChromeOS Team for reporting the CVE-2011-3148 and CVE-2011-3149 issues.

These updated pam packages include numerous bug fixes and enhancements. Space precludes documenting all of these changes in this advisory. Users are directed to the Red Hat Enterprise Linux 6.4 Technical Notes, linked to in the References, for information on the most significant of these changes.

All pam users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.

A stack-based buffer overflow flaw was found in the way the pam_env module parsed users' '~/.pam_environment' files. If an application's PAM configuration contained 'user_readenv=1' (this is not the default), a local attacker could use this flaw to crash the application or, possibly, escalate their privileges. (CVE-2011-3148)

A denial of service flaw was found in the way the pam_env module expanded certain environment variables. If an application's PAM configuration contained 'user_readenv=1' (this is not the default), a local attacker could use this flaw to cause the application to enter an infinite loop. (CVE-2011-3149)

The remote MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2013-122:01 advisory.

    PAM (Pluggable Authentication Modules) is a system security tool that allows system administrators to set     authentication policy without having to recompile programs that handle authentication.
    Security issues fixed with this release:
     CVE-2011-3148     Stack-based buffer overflow in the _assemble_line function in modules/pam_env/pam_env.c in Linux-PAM (aka     pam) before 1.1.5 allows local users to cause a denial of service (crash) and possibly execute arbitrary     code via a long string of white spaces at the beginning of the ~/.pam_environment file.
     CVE-2011-3149     The _expand_arg function in the pam_env module (modules/pam_env/pam_env.c) in Linux-PAM (aka pam) before     1.1.5 does not properly handle when environment variable expansion can overflow, which allows local users     to cause a denial of service (CPU consumption).

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

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

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-0521 advisory.

    - fix environment file handling problems - CVE-2011-3148 (#746619) and       CVE-2011-3148 (#746620)

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.

The pam_env module is vulnerable to a stack overflow (CVE-2011-3148) and a DoS condition (CVE-2011-3149) when parsing users .pam_environment files. Additionally a missing return value check inside pam_xauth has been fixed. (CVE-2010-3316)

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
65152	CentOS 6 : pam (CESA-2013:0521)	Nessus	CentOS Local Security Checks	2013/3/10	2021/1/4	medium
69719	Amazon Linux AMI : pam (ALAS-2013-160)	Nessus	Amazon Linux Local Security Checks	2013/9/4	2018/4/18	medium
290011	MiracleLinux 4 : pam-1.1.1-13.AXS4 (AXSA:2013-122:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	medium
68757	Oracle Linux 6 : pam (ELSA-2013-0521)	Nessus	Oracle Linux Local Security Checks	2013/7/12	2024/10/22	medium
57126	SuSE 11.1 Security Update : pam (SAT Patch Number 5342)	Nessus	SuSE Local Security Checks	2011/12/13	2021/1/19	medium
56701	SuSE 10 Security Update : pam (ZYPP Patch Number 7815)	Nessus	SuSE Local Security Checks	2011/11/3	2021/1/19	medium

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