Fixes: CVE-2013-0288 nss-pam-ldapd: FD_SET array index error, leading to stack-based buffer overflow

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.

Garth Mollett reports :

A file descriptor overflow issue in the use of FD_SET() in nss-pam-ldapd can lead to a stack-based buffer overflow. An attacker could, under some circumstances, use this flaw to cause a process that has the NSS or PAM module loaded to crash or potentially execute arbitrary code.

The remote Oracle Linux 6 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2013-0590 advisory.

    [0.7.5-18.1]
    - Apply upstream r1926 to resolve FD_SET array index error
    - Resolves: rhbz#915361

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

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

Garth Mollett discovered that a file descriptor overflow issue in the use of FD_SET() in nss-pam-ldapd, which provides NSS and PAM modules for using LDAP as a naming service, can lead to a stack-based buffer overflow. An attacker could, under some circumstances, use this flaw to cause a process that has the NSS or PAM module loaded to crash or potentially execute arbitrary code.

The remote Redhat Enterprise Linux 6 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2013:0590 advisory.

    The nss-pam-ldapd packages provide the nss-pam-ldapd daemon (nslcd), which     uses a directory server to lookup name service information on behalf of a     lightweight nsswitch module.

    An array index error, leading to a stack-based buffer overflow flaw, was     found in the way nss-pam-ldapd managed open file descriptors. An attacker     able to make a process have a large number of open file descriptors and     perform name lookups could use this flaw to cause the process to crash or,     potentially, execute arbitrary code with the privileges of the user running     the process. (CVE-2013-0288)

    Red Hat would like to thank Garth Mollett for reporting this issue.

    All users of nss-pam-ldapd are advised to upgrade to these updated     packages, which contain a backported patch to fix this issue.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

nss-pam-ldap was updated to fix a FD_SET overflow, happening when more than 1024 filedescriptors are opened. (CVE-2013-0288)

Updated nss-pam-ldapd packages fixes the following security vulnerability :

Garth Mollett discovered that a file descriptor overflow issue in the use of FD_SET() in nss-pam-ldapd can lead to a stack-based buffer overflow. An attacker could, under some circumstances, use this flaw to cause a process that has the NSS or PAM module loaded to crash or potentially execute arbitrary code.

The issue can be triggered in a network daemon by opening a large number of connections and forcing a name lookup. This would result in a crash and possibly remote code execution. This issue may also allow local privilege escalation if a suid program does name lookups and doesn't close file descriptors inherited from the parent process (CVE-2013-0288).

An array index error, leading to a stack-based buffer overflow flaw, was found in the way nss-pam-ldapd managed open file descriptors. An attacker able to make a process have a large number of open file descriptors and perform name lookups could use this flaw to cause the process to crash or, potentially, execute arbitrary code with the privileges of the user running the process. (CVE-2013-0288)

Updated nss-pam-ldapd packages that fix one security issue are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The nss-pam-ldapd packages provide the nss-pam-ldapd daemon (nslcd), which uses a directory server to lookup name service information on behalf of a lightweight nsswitch module.

An array index error, leading to a stack-based buffer overflow flaw, was found in the way nss-pam-ldapd managed open file descriptors. An attacker able to make a process have a large number of open file descriptors and perform name lookups could use this flaw to cause the process to crash or, potentially, execute arbitrary code with the privileges of the user running the process. (CVE-2013-0288)

Red Hat would like to thank Garth Mollett for reporting this issue.

All users of nss-pam-ldapd are advised to upgrade to these updated packages, which contain a backported patch to fix this issue.

ID	Name	Product	Family	Published	Updated	Severity
64940	Fedora 17 : nss-pam-ldapd-0.7.16-3.fc17 (2013-2754)	Nessus	Fedora Local Security Checks	3/1/2013	1/11/2021	medium
64743	FreeBSD : nss-pam-ldapd -- file descriptor buffer overflow (58c15292-7b61-11e2-95da-001e8c1a8a0e)	Nessus	FreeBSD Local Security Checks	2/21/2013	1/6/2021	medium
68771	Oracle Linux 6 : nss-pam-ldapd (ELSA-2013-0590)	Nessus	Oracle Linux Local Security Checks	7/12/2013	10/22/2024	critical
64671	Debian DSA-2628-1 : nss-pam-ldapd - buffer overflow	Nessus	Debian Local Security Checks	2/19/2013	1/11/2021	medium
65007	RHEL 6 : nss-pam-ldapd (RHSA-2013:0590)	Nessus	Red Hat Local Security Checks	3/5/2013	11/4/2024	critical
74939	openSUSE Security Update : nss-pam-ldapd (openSUSE-SU-2013:0522-2)	Nessus	SuSE Local Security Checks	6/13/2014	1/19/2021	medium
66118	Mandriva Linux Security Advisory : nss-pam-ldapd (MDVSA-2013:106)	Nessus	Mandriva Local Security Checks	4/20/2013	1/6/2021	medium
65020	Scientific Linux Security Update : nss-pam-ldapd on SL6.x i386/x86_64 (20130304)	Nessus	Scientific Linux Local Security Checks	3/5/2013	1/14/2021	medium
65161	CentOS 6 : nss-pam-ldapd (CESA-2013:0590)	Nessus	CentOS Local Security Checks	3/10/2013	1/4/2021	medium

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