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August 2005 Archive
Sourcefire VRT Certified Rules Update
Date: 2005-08-18
Synopsis:
The Sourcefire Vulnerability Research Team (VRT) has learned
of serious
vulnerabilities affecting Veritas Backup Agent for Windows and Novell
ZenWorks.
Details:
A vulnerability exists in Veritas Backup Exec Agent for
Windows. This
software uses Network Data Management Protocol (NDMP) to communicate
between clients and servers. Authentication is required to successfully
connect. A default user and MD-5 password hash can be used when MD-5
authentication is selected for a NDPM CONNECT_CLIENT_AUTH command to
the server.
A Rule to provide coverage against attacks targeting this
vulnerability
is included in this rule pack and is identified as sid 4126.
Novell ZenWorks Remote Management Agent suffers from a
programming
error that may allow a remote and unauthenticated attacker to access
memory space to the extent that it may be possible to execute code of
their choosing and take control of a vulnerable system.
Rules to provide coverage against attacks targeting this
vulnerability
are included in this rule pack and are identified as sids 4129 and
4130.
Note: In order to use the Novell ZenWorks rules correctly,
port 1761 must be added to the stream4_reassemble line in the snort
configuration file.
To add port 1761 to the TCP reassembly configuration:
- Open the snort.conf file in a text editor
- Move to the line containing "preprocessor
stream4_reassemble"
- Replace the line with the following:
preprocessor stream4_reassemble: clientonly, ports 21 23 25 53 80 110
111 139 143 445 513 1433 1761
- Save the configuration
- Restart Snort
Rule Pack Summary:
For a complete list of new and modified rules, click
here.
Warning:
Sourcefire VRT rule packs often utilize enhancements made to
Snort. Operators should
upgrade to the latest revision or patch level for Snort to ensure these
enhancements are
available before using these rules.
About the VRT:
The Sourcefire VRT is a group of leading edge intrusion
detection and
prevention experts working to proactively discover, assess and respond
to the latest trends in hacking activity, intrusion attempts and
vulnerabilities. This team is also supported by the vast resources of
the open source Snort community, making it the largest group dedicated
to advances in network security industry.
Posted by on Aug 18, 2005
Sourcefire VRT Certified Rules Update
Date: 2005-08-15
Update
The Sourcefire Vulnerability Research Team (VRT) is continuing to
investigate the Zotob worm and associated Microsoft PnP Vulnerability.
The VRT released rules on August 12th, 2005 that detect all attempts to
exploit this vulnerability. These rules are identified as sids 3828
through 4125. The Zotob worm will alert on SID 3999. Inline users may
wish to set this rule to 'drop' for added protection.
To ensure detection/prevention of all variants of the worm and
additional potential attack vectors, the VRT recommends using Snort v2.3.x
or higher. This will ensure the latest detection capabilities are being
utilized. In addition, Snort v2.3.x uses are advised to make the following
configuration change to snort.conf.
Add ports 139 and 445 to the TCP reassembly configuration.
- Open the snort.conf file in a text editor
- Move to the line containing "preprocessor stream4_reassemble"
- Replace the line with the following:
preprocessor stream4_reassemble: clientonly, ports 21 23 25 53 80 110 111 139 143 445 513 1433
- Save the configuration
- Restart Snort
This configuration change is required regardless of the rules being
used to detect attacks against the PnP vulnerability. Snort users running
Snort version 2.4 and later need not make this change unless they
have specified ports to reassemble in the snort.conf already. In this
case, make sure the ports 139 and 445 are added to the list.
| Snort users should note that rules written specifically to detect the
currently known variants of Zotob may be evaded with each subsequent
variation and will be prone to an increased false positive threshold.
The Sourcefire VRT rules use the advanced capabilities of current
versions of snort to nullify the evasion attempts of attack vector
variants. |
Date: 2005-08-14
Update:
The Sourcefire Vulnerability Research Team (VRT) has received reports of a new
worm variant, known as Zotob, that makes use of the Plug-and-Play (PnP) vulnerability
(MS05-039) to propagate. The worm uses exploit code that targets the PnP issue
via port 445 and upon successful exploitation, it then uses ftp to transfer
data from the infecting machine. The newly infected machine then becomes an
ftp server itself and begins scanning for other vulnerable hosts to infect.
The VRT released rules
on August 12th, 2005 that detect all attempts to exploit
this vulnerability. These rules are identified as sids 3828 through 4125. The
Zotob worm will alert on SID 3999. Inline users may wish to set this rule to
'drop' for added protection.
In addition, a patch for this vulnerability is available at http://www.microsoft.com/technet/security/Bulletin/MS05-039.mspx.
About the VRT:
The Sourcefire VRT is a group of leading edge intrusion detection and
prevention experts working to proactively discover, assess and respond
to the latest trends in hacking activity, intrusion attempts and
vulnerabilities. This team is also supported by the vast resources of
the open source Snort community, making it the largest group dedicated
to advances in network security industry.
Posted by on Aug 14, 2005
Sourcefire VRT Certified Rules Update
Date: 2005-08-12
Synopsis:
The Sourcefire Vulnerability Research Team (VRT) has learned of a serious vulnerability affecting Microsoft Windows systems, additionally exploit code that targets the vulnerability is in distribution.
Details:
A programming error in the Plug and Play (PnP) service used by Microsoft Windows machines can present a remote attacker with the opportunity to overflow a fixed length buffer, execute code on the vulnerable system and escalate privileges on the host to the extent that they could take complete control of the affected machine.
Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3828 through 4125.
Rule Pack Summary:
For a complete list of new and modified rules,
click here.
Warning:
Sourcefire VRT rule packs often utilize enhancements made to Snort. Operators should
upgrade to the latest revision or patch level for Snort to ensure these enhancements are
available before using these rules.
About the VRT:
The Sourcefire VRT is a group of leading edge intrusion detection and
prevention experts working to proactively discover, assess and respond
to the latest trends in hacking activity, intrusion attempts and
vulnerabilities. This team is also supported by the vast resources of
the open source Snort community, making it the largest group dedicated
to advances in network security industry.
Posted by on Aug 12, 2005
