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

[GLSA]

Gentoo Linux Security Advisory

Title: Net-SNMP: Multiple vulnerabilities (GLSA 200808-02)
Severity: normal
Exploitable: remote
Date: August 06, 2008
Bug(s): #222265, #225105
ID: 200808-02

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: net-analyzer/net-snmp
Vulnerable: < 5.4.1.1
Unaffected: >= 5.4.1.1
Architectures: All supported architectures


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: