glibc security and bug fix update (RHSA-2012-0125)

Original Release Date: April 11, 2012
Last Revised: April 19, 2013
Number: ASA-2012-155
Risk Level: Low
Advisory Version: 4.0
Advisory Status: Interim

1. Overview:

The glibc packages contain the standard C libraries used by multiple programs on the system. These packages contain the standard C and the standard math libraries. Without these two libraries, a Linux system cannot function properly.

An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way the glibc library read timezone files. If a carefully-crafted timezone file was loaded by an application linked against glibc, it could cause the application to crash or, potentially, execute arbitrary code with the privileges of the user running the application. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2009-5029 to this issue.

A flaw was found in the way the ldd utility identified dynamically linked libraries. If an attacker could trick a user into running ldd on a malicious binary, it could result in arbitrary code execution with the privileges of the user running ldd. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2009-5064 to this issue.

It was discovered that the glibc addmntent() function, used by various mount helper utilities, did not sanitize its input properly. A local attacker could possibly use this flaw to inject malformed lines into the mtab (mounted file systems table) file via certain setuid mount helpers, if the attacker were allowed to mount to an arbitrary directory under their control. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2010-0296 to this issue.

An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way the glibc library loaded ELF (Executable and Linking Format) files. If a carefully-crafted ELF file was loaded by an application linked against glibc, it could cause the application to crash or, potentially, execute arbitrary code with the privileges of the user running the application. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2010-0830 to this issue.

It was discovered that the glibc fnmatch() function did not properly restrict the use of alloca(). If the function was called on sufficiently large inputs, it could cause an application using fnmatch() to crash or, possibly, execute arbitrary code with the privileges of the application. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2011-1071 to this issue.

It was found that the glibc addmntent() function, used by various mount helper utilities, did not handle certain errors correctly when updating the mtab (mounted file systems table) file. If such utilities had the setuid bit set, a local attacker could use this flaw to corrupt the mtab file. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2011-1089 to this issue.

It was discovered that the locale command did not produce properly escaped output as required by the POSIX specification. If an attacker were able to set the locale environment variables in the environment of a script that performed shell evaluation on the output of the locale command, and that script were run with different privileges than the attacker's, it could execute arbitrary code with the privileges of the script. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2011-1095 to this issue.

An integer overflow flaw was found in the glibc fnmatch() function. If an attacker supplied a long UTF-8 string to an application linked against glibc, it could cause the application to crash. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2011-1659 to this issue.

A denial of service flaw was found in the remote procedure call (RPC) implementation in glibc. A remote attacker able to open a large number of connections to an RPC service that is using the RPC implementation from glibc, could use this flaw to make that service use an excessive amount of CPU time. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2011-4609 to this issue.

More information about these vulnerabilities can be found in the security advisory issued by Red Hat:

2. Avaya System Products using a modified version of RHEL4 with affected packages installed:

Product: Affected Version(s): Risk Level: Actions:
Avaya Aura® Communication Manager 4.0.x thru 5.2, 5.2.1 including SSP1, SSP2 and SSP3 Low For 5.2 and earlier, upgrade to 5.2.1 and install Security Service Pack 4 or later.
For 5.2.1, install Security Service Pack 4 or later.
Avaya IQ 4.x Low See recommended actions below.  This issue will be addressed in accordance with section five of Avaya's Product Security Vulnerability Response Policy
Avaya Meeting Exchange 5.x Low Upgrade to 6.2 or later.
Avaya Message Networking 5.2 thru 5.2.4 Low Upgrade to 5.2.5 or later.
Avaya Message Storage Server 5.2 thru 5.2.13 Low Upgrade to 5.2.14 or later.
Avaya Proactive Contact 4.x Low Upgrade to 5.1 or later.
Avaya Aura® SIP Enablement Services 4.0.x thru 5.2, 5.2.1 including SSP1, SSP2 and SSP3 Low For 5.2 and earlier, upgrade to 5.2.1 and install Security Service Pack 4 or later.
For 5.2.1, install Security Service Pack 4 or later.

Recommended Actions for System Products:
Avaya strongly recommends that customers follow networking and security best practices by implementing firewalls, ACLs, physical security or other appropriate access restrictions. Though Avaya believes such restrictions should always be in place, risk to Avaya products and the surrounding network from this potential vulnerability may be mitigated by ensuring these practices are implemented until such time as an Avaya provided product update or the recommended Avaya action is applied. Further restrictions as deemed necessary based on the customer's security policies may be required during this interim period, but customers should not modify the System Product operating system or application unless the change is approved by Avaya. Making changes that are not approved may void the Avaya product service contract.

Mitigating Factors:

When determining risk, Avaya takes into account many factors as outlined by Avaya's Security Vulnerability Classification Policy. The following table describes factors that mitigate the risk of specific vulnerabilities for affected Avaya products:

Vulnerability Mitigating Factors
CVE-2009-5029
CVE-2009-5064
CVE-2010-0296
CVE-2010-0830
CVE-2011-1071
CVE-2011-1089
CVE-2011-1095
CVE-2011-1659
These are a low risk as they would require privileged account access.
CVE-2011-4609 This is a low risk as the RPC implementation from glibc is not used.

3. Avaya Software-Only Products:

Avaya software-only products operate on general-purpose operating systems. Occasionally vulnerabilities may be discovered in the underlying operating system or applications that come with the operating system. These vulnerabilities often do not impact the software-only product directly but may threaten the integrity of the underlying platform.

In the case of this advisory Avaya software-only products are not affected by the vulnerability directly but the underlying Linux platform may be. Customers should determine on which Linux operating system the product was installed and then follow that vendor's guidance.

Product: Actions:
Avaya Aura® Application Enablement Services 4.x/5.x Depending on the Operating System provided by customers, the affected package may be installed on the underlying Operating System supporting the AES application.
CVLAN Depending on the Operating System provided by customers, the affected package may be installed on the underlying Operating System supporting the CVLAN application.
Avaya Aura® Experience Portal Depending on the Operating System provided by customers, the affected package may be installed on the underlying Operating System supporting the EP application.
Avaya Integrated Management Suite (IMS) Depending on the Operating System provided by customers, the affected package may be installed on the underlying Operating System supporting the IMS application.
Avaya Aura® Presence Services Depending on the Operating System provided by customers, the affected package may be installed on the underlying Operating System supporting the PS application.
Avaya Secure Access Link Gateway Depending on the Operating System provided by customers, the affected package may be installed on the underlying Operating System supporting the SAL Gateway application.
Avaya Aura® System Manager 1.0 Depending on the Operating System provided by customers, the affected package may be installed on the underlying Operating System supporting the SMGR application.
Avaya Voice Portal Depending on the Operating System provided by customers, the affected package may be installed on the underlying Operating System supporting the VP application.

Recommended Actions for Software-Only Products:
In the event that the affected package is installed, Avaya recommends that customers follow recommended actions supplied by Red Hat regarding their Enterprise Linux.

4. Additional Information:

Additional information may also be available via the Avaya support website and through your Avaya account representative. Please contact your Avaya product support representative, or dial 1-800-242-2121, with any questions.

5. Disclaimer:

ALL INFORMATION IS BELIEVED TO BE CORRECT AT THE TIME OF PUBLICATION AND IS PROVIDED "AS IS". AVAYA INC., ON BEHALF ITSELF AND ITS SUBSIDIARIES AND AFFILIATES (HEREINAFTER COLLECTIVELY REFERRED TO AS "AVAYA"), DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND FURTHERMORE, AVAYA MAKES NO REPRESENTATIONS OR WARRANTIES THAT THE STEPS RECOMMENDED WILL ELIMINATE SECURITY OR VIRUS THREATS TO CUSTOMERS' SYSTEMS. IN NO EVENT SHALL AVAYA BE LIABLE FOR ANY DAMAGES WHATSOEVER ARISING OUT OF OR IN CONNECTION WITH THE INFORMATION OR RECOMMENDED ACTIONS PROVIDED HEREIN, INCLUDING DIRECT, INDIRECT, INCIDENTAL, STATUTORY, CONSEQUENTIAL DAMAGES, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF AVAYA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

THE INFORMATION PROVIDED HERE DOES NOT AFFECT THE SUPPORT AGREEMENTS IN PLACE FOR AVAYA PRODUCTS. SUPPORT FOR AVAYA PRODUCTS CONTINUES TO BE EXECUTED AS PER EXISTING AGREEMENTS WITH AVAYA.

6. Revision History:

V 1.0 - April 11, 2012 - Initial Statement issued.
V 2.0 - February 12, 2013 - Changed MN and MSS affected versions and actions.
V 3.0 - March 26, 2013 - Changed MX and PC actions.
V 4.0 - April 19, 2013 - Changed CM and SES affected versions and actions.

Send information regarding any discovered security problems with Avaya products to either the contact noted in the product's documentation or securityalerts@avaya.com.

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