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full-disclosure-uk: [Full-disclosure] [ GLSA 200808-02 ] Net-SNM

[Full-disclosure] [ GLSA 200808-02 ] Net-SNMP: Multiple vulnerabilities

From: Robert Buchholz <rbu_at_nospam>
Date: Wed Aug 06 2008 - 00:30:01 GMT
To: gentoo-announce@gentoo.org

  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200808-02
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Severity: Normal Title: Net-SNMP: Multiple vulnerabilities Date: August 06, 2008 Bugs: #222265, #225105 ID: 200808-02
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Synopsis


Multiple vulnerabilities in Net-SNMP allow for authentication bypass in snmpd and execution of arbitrary code in Perl applications using Net-SMNP.

Background


Net-SNMP is a collection of tools for generating and retrieving SNMP data. The SNMPv3 protocol uses a keyed-Hash Message Authentication Code (HMAC) to verify data integrity and authenticity of SNMP messages.

Affected packages



Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-analyzer/net-snmp < 5.4.1.1 >= 5.4.1.1

Description


Wes Hardaker reported that the SNMPv3 HMAC verification relies on the client to specify the HMAC length (CVE-2008-0960). John Kortink reported a buffer overflow in the Perl bindings of Net-SNMP when processing the OCTETSTRING in an attribute value pair (AVP) received by an SNMP agent (CVE-2008-2292).

Impact


An attacker could send SNMPv3 packets to an instance of snmpd providing a valid user name and an HMAC length value of 1, and easily conduct brute-force attacks to bypass SNMP authentication. An attacker could further entice a user to connect to a malicious SNMP agent with an SNMP client using the Perl bindings, possibly resulting in the execution of arbitrary code.

Workaround


There is no known workaround at this time.

Resolution


All Net-SNMP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-analyzer/net-snmp-5.4.1.1"

References


  [ 1 ] CVE-2008-0960
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0960   [ 2 ] CVE-2008-2292
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2292

Availability


This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200808-02.xml

Concerns?


Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.

License


Copyright 2008 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5



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