nss-pam-ldapd before 0.7.18 and 0.8.x before 0.8.11 allows context-dependent attackers to cause a denial of service (application crash) and possibly execute arbitrary code by performing a name lookup on an application with a large number of open file descriptors, which triggers a stack-based buffer overflow related to incorrect use of the FD_SET macro.

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

From Red Hat Security Advisory 2013:0590 :

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.

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).

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.

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)

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.

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

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

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.

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.

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

Detections

Analytics

CVE-2013-0288

critical

Tenable Plugins

medium

medium

medium

medium

medium

critical

medium

medium

medium