Security Vulnerabilities in the GNU Zebra and Quagga BGP Routing Daemon May Allow for Denial of Service

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Security Vulnerabilities in the GNU Zebra and Quagga BGP Routing Daemon May Allow for Denial of Service

1. Impact

Multiple security vulnerabilities in the Quagga and GNU Zebra routing software shipped with Solaris 10 may allow a remote unprivileged user connecting from an untrusted remote BGP peer to cause a Denial of Service (DoS) to the BGP daemon.

These issue are described in the following documents:
   

2. Contributing Factors

These issues can occur in the following releases:

SPARC Platform:

• Solaris 10 without patch 126206-04
  

x86 Platform:  

• Solaris 10 without patch 126207-04

These issues affect only users who have enabled the BGP routing protocol AND have configured BGP sessions with untrusted, remote BGP peers. These issues apply equally to the 'GNU Zebra' BGP daemon and its successor, 'Quagga'.

In such cases, it is possible for the remote peer to send certain malformed BGP packets which will cause the BGP daemon to assert and exit, disrupting or even disabling BGP service.
   
To determine if the BGP protocol is enabled, use the 'pgrep bgpd' command:
   
   
On a Solaris 10 system which has patch 126206-02 (SPARC) or 126207-02 (x86) or later applied, or on a Solaris 10 8/07 system, SMF can be queried:
   

3. Symptoms

There are no predictable symptoms that would indicate the described issues have occurred.

4. Workaround

To work around the described issues until a patch can be applied, disable sessions to untrusted BGP peers. This can be done by configuring a BGP peer/neighbor as 'shutdown' in the configuration file, or via the telnet interface (if enabled):
   
   
Alternatively, on Solaris 10 8/07 and Solaris 10 systems with patch 126206-02 (SPARC) or 126207-02 (x86) or later applied, the BGP service can be disabled entirely via SMF:

   
On other Solaris 10 systems, the BGP daemon can be disabled with the following command:
   

5. Resolution

These issues are addressed in the following releases:

SPARC Platform:

• Solaris 10 with patch 126206-04 or later
  

x86 Platform:  

• Solaris 10 with patch 126207-04 or later

For more information on Security Sun Alerts, see Technical Instruction ID 213557.

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