pam_krb5 2.2.14 in Red Hat Enterprise Linux (RHEL) 5 and earlier, when the existing_ticket option is enabled, uses incorrect privileges when reading a Kerberos credential cache, which allows local users to gain privileges by setting the KRB5CCNAME environment variable to an arbitrary cache filename and running the (1) su or (2) sudo program. NOTE: there may be a related vector involving sshd that has limited relevance.

The remote VMware ESX / ESXi host is missing a security-related patch.
It is, therefore, affected by multiple vulnerabilities, including remote code execution vulnerabilities, in several third-party components and libraries :

  - Apache Tomcat 
  - Apache Tomcat Manager
  - cURL 
  - Java Runtime Environment (JRE)
  - Kernel 
  - Microsoft SQL Express
  - OpenSSL
  - pam_krb5

The remote Oracle Linux 5 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2008-0907 advisory.

    [2.2.14-1.el5_2.1]
    - add backported fix for ccache permissions bypass when the existing_ticket       option is used (CVE-2008-3825, #462112)

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.

pam_krb5 address the following security issue :

A flaw was found in the pam_krb5 'existing_ticket' configuration option. If a system is configured to use an existing credential cache via the 'existing_ticket' option, it may be possible for a local user to gain elevated privileges by using a different, local user's credential cache. (CVE-2008-3825)

krb5 address the following bug :

  - In cases where a server application began to     sequentially iterate through the contents of a keytab     file, if it paused to call certain functions such as     krb5_rd_req() which encountered errors, a subsequent     call to the krb5_kt_next_entry() function could cause     the calling application to crash. The issue has been     rectified and updated within these packages so that a     call to the krb5_kt_next_entry() function will not crash     the calling application.

a. vCenter Server and vCenter Update Manager update Microsoft    SQL Server 2005 Express Edition to Service Pack 3

   Microsoft SQL Server 2005 Express Edition (SQL Express)    distributed with vCenter Server 4.1 Update 1 and vCenter Update    Manager 4.1 Update 1 is upgraded from  SQL Express Service Pack 2    to SQL Express Service Pack 3, to address multiple security    issues that exist in the earlier releases of Microsoft SQL Express.

   Customers using other database solutions need not update for    these issues.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2008-5416, CVE-2008-0085, CVE-2008-0086,    CVE-2008-0107 and CVE-2008-0106 to the issues addressed in MS SQL    Express Service Pack 3.

b. vCenter Apache Tomcat Management Application Credential Disclosure

   The Apache Tomcat Manager application configuration file contains    logon credentials that can be read by unprivileged local users.

   The issue is resolved by removing the Manager application in    vCenter 4.1 Update 1.

   If vCenter 4.1 is updated to vCenter 4.1 Update 1 the logon    credentials are not present in the configuration file after the    update.

   VMware would like to thank Claudio Criscione of Secure Networking    for reporting this issue to us.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2010-2928 to this issue.

c. vCenter Server and ESX, Oracle (Sun) JRE is updated to version    1.6.0_21

   Oracle (Sun) JRE update to version 1.6.0_21, which addresses    multiple security issues that existed in earlier releases of    Oracle (Sun) JRE.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the following names to the security issues fixed in    Oracle (Sun) JRE 1.6.0_19: CVE-2009-3555, CVE-2010-0082,    CVE-2010-0084, CVE-2010-0085, CVE-2010-0087, CVE-2010-0088,    CVE-2010-0089, CVE-2010-0090, CVE-2010-0091, CVE-2010-0092,    CVE-2010-0093, CVE-2010-0094, CVE-2010-0095, CVE-2010-0837,    CVE-2010-0838, CVE-2010-0839, CVE-2010-0840, CVE-2010-0841,    CVE-2010-0842, CVE-2010-0843, CVE-2010-0844, CVE-2010-0845,    CVE-2010-0846, CVE-2010-0847, CVE-2010-0848, CVE-2010-0849,    CVE-2010-0850.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the following name to the security issue fixed in    Oracle (Sun) JRE 1.6.0_20: CVE-2010-0886.

d. vCenter Update Manager Oracle (Sun) JRE is updated to version   1.5.0_26

   Oracle (Sun) JRE update to version 1.5.0_26, which addresses    multiple security issues that existed in earlier releases of    Oracle (Sun) JRE.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the following names to the security issues fixed in    Oracle (Sun) JRE 1.5.0_26: CVE-2010-3556, CVE-2010-3566,    CVE-2010-3567, CVE-2010-3550, CVE-2010-3561, CVE-2010-3573,    CVE-2010-3565,CVE-2010-3568, CVE-2010-3569,  CVE-2009-3555,    CVE-2010-1321, CVE-2010-3548, CVE-2010-3551, CVE-2010-3562,    CVE-2010-3571, CVE-2010-3554, CVE-2010-3559, CVE-2010-3572,    CVE-2010-3553, CVE-2010-3549, CVE-2010-3557, CVE-2010-3541,    CVE-2010-3574.

e. vCenter Server and ESX Apache Tomcat updated to version 6.0.28

   Apache Tomcat updated to version 6.0.28, which addresses multiple    security issues that existed in earlier releases of Apache Tomcat

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the following names to the security issues fixed in    Apache Tomcat 6.0.24: CVE-2009-2693, CVE-2009-2901, CVE-2009-2902,i    and CVE-2009-3548.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the following names to the security issues fixed in    Apache Tomcat 6.0.28: CVE-2010-2227, CVE-2010-1157.

f. vCenter Server third-party component OpenSSL updated to version    0.9.8n

   The version of the OpenSSL library in vCenter Server is updated to    0.9.8n.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2010-0740 and CVE-2010-0433 to the    issues addressed in this version of OpenSSL.

g. ESX third-party component OpenSSL updated to version 0.9.8p

   The version of the ESX OpenSSL library is updated to 0.9.8p.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2010-3864 and CVE-2010-2939 to the    issues addressed in this update.

h. ESXi third-party component cURL updated

   The version of cURL library in ESXi is updated.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2010-0734 to the issues addressed in    this update.

i. ESX third-party component pam_krb5 updated

   The version of pam_krb5 library is updated.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2008-3825 and CVE-2009-1384 to the    issues addressed in the update.

j. ESX third-party update for Service Console kernel

   The Service Console kernel is updated to include kernel version    2.6.18-194.11.1.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2010-1084, CVE-2010-2066, CVE-2010-2070,    CVE-2010-2226, CVE-2010-2248, CVE-2010-2521, CVE-2010-2524,    CVE-2010-0008, CVE-2010-0415, CVE-2010-0437, CVE-2009-4308,    CVE-2010-0003, CVE-2010-0007, CVE-2010-0307, CVE-2010-1086,    CVE-2010-0410, CVE-2010-0730, CVE-2010-1085, CVE-2010-0291,    CVE-2010-0622, CVE-2010-1087, CVE-2010-1173, CVE-2010-1437,    CVE-2010-1088, CVE-2010-1187, CVE-2010-1436, CVE-2010-1641, and    CVE-2010-3081 to the issues addressed in the update.

   Notes :
   - The update also addresses the 64-bit compatibility mode    stack pointer underflow issue identified by CVE-2010-3081. This    issue was patched in an ESX 4.1 patch prior to the release of    ESX 4.1 Update 1 and in a previous ESX 4.0 patch release.
   - The update also addresses CVE-2010-2240 for ESX 4.0.

An updated pam_krb5 package that fixes a security issue is now available for Red Hat Enterprise Linux 5.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

The pam_krb5 module allows Pluggable Authentication Modules (PAM) aware applications to use Kerberos to verify user identities by obtaining user credentials at log in time.

A flaw was found in the pam_krb5 'existing_ticket' configuration option. If a system is configured to use an existing credential cache via the 'existing_ticket' option, it may be possible for a local user to gain elevated privileges by using a different, local user's credential cache. (CVE-2008-3825)

Red Hat would like to thank Stephane Bertin for responsibly disclosing this issue.

Users of pam_krb5 should upgrade to this updated package, which contains a backported patch to resolve this issue.

Insufficient file access permissions checks allowed users to read Kerberos tickes of other users if pam_krb5 was configured with the option 'existing_ticket' (CVE-2008-3825).

St&Atilde;&copy;phane Bertin discovered a flaw in the pam_krb5 existing_ticket configuration option where, if enabled and using an existing credential cache, it was possible for a local user to gain elevated privileges by using a different, local user's credential cache (CVE-2008-3825).

The updated packages have been patched to prevent this issue.

Update :

An updated package for Mandriva Linux 2009.0 is now available.

Insufficient file access permissions checks allowed users to read Kerberos tickes of other users if pam_krb5 was configured with the option 'existing_ticket'. (CVE-2008-3825)

This update adds a backported fix for CVE-2008-3825, a credential cache permission bypass which becomes possible when the 'existing_ticket' option is enabled.

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.

ID	Name	Product	Family	Severity
89674	VMware ESX / ESXi Third-Party Libraries Multiple Vulnerabilities (VMSA-2011-0003) (remote check)	Nessus	Misc.	high
67753	Oracle Linux 5 : pam_krb5 (ELSA-2008-0907)	Nessus	Oracle Linux Local Security Checks	critical
60481	Scientific Linux Security Update : pam_krb5/krb5 on SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	medium
51971	VMSA-2011-0003 : Third-party component updates for VMware vCenter Server, vCenter Update Manager, ESXi and ESX	Nessus	VMware ESX Local Security Checks	high
43712	CentOS 5 : pam_krb5 (CESA-2008:0907)	Nessus	CentOS Local Security Checks	medium
40098	openSUSE Security Update : pam_krb5 (pam_krb5-218)	Nessus	SuSE Local Security Checks	medium
36566	Mandriva Linux Security Advisory : pam_krb5 (MDVSA-2008:209-1)	Nessus	Mandriva Local Security Checks	medium
35007	openSUSE 10 Security Update : pam_krb5 (pam_krb5-5624)	Nessus	SuSE Local Security Checks	medium
35006	SuSE 10 Security Update : pam_krb5 (ZYPP Patch Number 5616)	Nessus	SuSE Local Security Checks	medium
34344	Fedora 9 : pam_krb5-2.3.0-2.fc9 (2008-8618)	Nessus	Fedora Local Security Checks	medium
34343	Fedora 8 : pam_krb5-2.2.18-2.fc8 (2008-8605)	Nessus	Fedora Local Security Checks	medium
34333	RHEL 5 : pam_krb5 (RHSA-2008:0907)	Nessus	Red Hat Local Security Checks	medium

Detections

Analytics

CVE-2008-3825

critical

Tenable Plugins

high

critical

medium

high

medium

medium

medium

medium

medium

medium

medium

medium