VRT Advisories
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VRT Rules 2005-03-28
Sourcefire VRT Certified Rule Update
Date: 2005-03-28
Synopsis:
The Sourcefire Vulnerability Research Team (VRT) has learned of serious vulnerabilities affecting MySQL. In addition, the VRT has leveraged new detection engine capabilities to provide coverage for an FTP port bounce attack.
The VRT has also added rules and improved detection capabilities as a result of ongoing research into serious vulnerabilities affecting Computer Associates License Server, BrightStor ARCserver and Oracle database servers.
Details:
A vulnerability exists in MySQL's handling of the CREATE FUNCTION command, possibly allowing an authenticated user with INSERT and DELETE privileges for the administrative databases to execute arbitrary code.
A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 3528.
The PORT command can be used in an FTP PORT bounce attack to establish a connection between the FTP server and another machine listening on an alternative port. This may lead to unauthorized access to a target host listening on a port not available from outside the protected network.
A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 3441.
Computer Associates License software allows a site to maintain and handle licenses for CA products. A server runs the software to facilitate this and it communicates with clients/agents on the network. A vulnerability exists in some GCR messages that exchange data with a listening server or client.
Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3524, 3525 and 3529.
A vulnerability exists in the way that the BrightStor ARCserve discovery service processes client messages. Client product information messages and client slot information messages that contain an overly long client name or client domain value can cause a buffer overflow.
Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3530 and 3531.
The Oracle XDB UNLOCK command is vulnerable to a buffer overflow attack. A fixed size buffer is allocated for a parameter associated with the command. A user-supplied parameter value that is longer than the allocated buffer can cause a buffer overflow and allow the subsequent execution of arbitrary commands on a vulnerable server.
A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 3526.
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 Mar 28, 2005
VRT Rules 2005-03-16
Sourcefire VRT Certified Rule Update
Date: 2005-03-16
Synopsis:
The Sourcefire Vulnerability Research Team (VRT) has learned of serious vulnerabilities affecting Oracle database servers, Computer Associates License server and MySQL MaxDB WebSQL service.
Details
Oracle UTL_FILE commands allow a user to read, write, copy, or delete files in locations and directories authorized to the user. However, sufficient checks are not performed to ensure that the user does not attempt to employ a directory traversal technique to manipulate files outside the authorized directories.
Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3512 through 3516.
Computer Associates License software allows a site to maintain and handle licenses for CA products. A server runs the software to facilitate this and it communicates with clients/agents on the network. A programming error may present an attacker with the opportunity to overflow a static buffer and possibly execute code of their choosing on the affected host.
Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3520 through 3522 and 3517.
The MySQL MaxDB WebSQL service suffers from a programming error that may allow an attacker to overflow a static buffer by supplying excess data in the parameter to the password value. The attacker may then be able to execute code of their choosing on the affected host.
Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3518 and 3519.
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 Sourcefire Vulnerability Research Team
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 Mar 16, 2005
VRT Rules 2005-03-09
Sourcefire VRT Certified Rule Update
Date: 2005-03-09
Synopsis:
The Sourcefire Vulnerability Research Team (VRT) has learned of serious vulnerabilities affecting Computer Associates BrightStor ARCserver.
The VRT has also added rules and improved detection capabilities of existing rules as a result of ongoing research into vulnerabilities with Microsoft applications using SSL.
Details
A vulnerability exists in the way that the BrightStor ARCserver discovery service processes client messages. Client product information messages and client slot information messages that contain an overly long client name or client domain value can cause a buffer overflow.
Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3474 through 3485.
Poor error handling routines in the Microsoft Secure Sockets Layer (SSL) library, specifically in the handling of SSL Version 2 requests, present opportunites to cause a DoS condition in various software implementations used on Microsoft operating systems.
Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3486 through 3511.
Rule Pack Summary
For a complete list of new and modified rules, click here.
Rules:
VRT Certified Rule Updates are available to users in the following ways:
- Subscribers will receive rulesets in real-time as they are released to Sourcefire customers - 5 days ahead of Registered users
- Registered users will receive rulesets when they are published
- Unregistered users will receive access to a static ruleset containing only the latest rules at the time of each Snort point release.
About the Sourcefire Vulnerability Research Team
The Sourcefire Vulnerability Research Team (VRT) is a group of leading edge intrusion detection and prevention experts working to 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 Mar 09, 2005
Snort_update_20051018
Snort Back Orifice Vulnerability
Date: 2005-10-18
The Sourcefire Vulnerability Research Team (VRT) has learned of a vulnerability in Snort v2.4.0 - 2.4.2. Users are only vulnerable if the Back Orifice preprocessor is enabled. Snort v2.4.3 has been released to correct the issue. In addition, detailed instructions for mitigating the issue by disabling the Back Orifice preprocessor are included below.
Snort v2.4.3:
In addition to fixing the vulnerability, this version includes a mechanism to detect exploits against vulnerable sensors and, optionally for inline sensors, drop the offending traffic. These features enables a phased approach to upgrading while protecting unpatched sensors. Detection capabilities are part of the new preprocessor and therefore are available to all users regardless of subscription status.
In addition to the source tarball, postgres, mysql and plain RPMs and a win32 installer are available here. Please remember that updated rules are only included in major releases. Click here for updated rules.
Mitigation Instructions:
The Back Orifice preprocessor can be disabled by commenting out the line "preprocessor bo" in snort.conf. This can be done in any text editor using the following procedure:
- Locate the line "preprocessor bo"
- Comment out this line by preceding it with a hash (#). The new line will look like "#preprocessor bo"
- Save the file
- Restart snort
Background:
On Thursday, October 13th Sourcefire was contacted by USCERT with news of a vulnerability in Snort. We used the subsequent days to verify the vulnerability and to prepare mitigation strategies and the software updates necessary to fix the vulnerability for both Sourcefire customers and Snort users. While it cannot be said that no other problems will ever be found in the Snort code base, we can state that we will redouble our efforts to ensure the security of the system so many people have come to rely on for the detection of network-based threats. Sourcefire will also continue to work with the most sophisticated testing facilities in the industry to assure that every reasonable step is being taken to provide the most secure code base possible.
Technical Details:
The Back Orifice preprocessor contains a stack-based buffer overflow. This vulnerability could be leveraged by an attacker to execute code remotely on a Snort sensor where the Back Orifice preprocessor is enabled. However, there are a number of factors that make remote code execution difficult to achieve across different builds of Snort on different platforms, even on the same platform with different compiler versions, and it is more likely that an attacker could use the vulnerability as a denial of service attack.
If you have any questions, please contact the snort team.
Posted by on Jan 01, 2005
Advisory
This release adds and modifies rules in several categories.
view advisory | view changelogPosted by on Jan 01, 2000
