When is a 0day not a 0day? Samba symlink bad default config

Published: 2010-02-09
Last Updated: 2011-02-08 23:49:20 UTC
by Adrien de Beaupre (Version: 1)
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When is a 0day not a 0day? When the exploit ends up being just a poor default configuration issue. It can lead to files being read, that the user has permission to read. Like /etc/passwd for example. The solution? Set "wide links = no" in the [global] section of your smb.conf and restart smbd to eliminate this problem, from the Samba Symlink Attack posting here. Thanks Elazar!

Cheers,
Adrien de Beaupré
Intru-shun.ca Inc.

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February 2010 Black Tuesday Overview

Published: 2010-02-09
Last Updated: 2010-02-09 19:28:42 UTC
by Johannes Ullrich (Version: 1)
1 comment(s)

 Overview of the February 2010 Microsoft patches and their status.

# Affected Contra Indications Known Exploits Microsoft rating ISC rating(*)
clients servers
MS10-003 Vulnerability in Microsoft Office (MSO) Could Allow Remote Code Execution (Windows and OS X) (Replaces MS09-062)
Office
CVE-2010-0243
KB 978214 no known exploits. Severity:Important
Exploitability: 1
Critical Important
MS10-004 Vulnerabilities in Microsoft Office PowerPoint Could Allow Remote Code Execution (Windows and OS X)
Powerpoint
CVE-2010-0029
CVE-2010-0030
CVE-2010-0031
CVE-2010-0032
CVE-2010-0033
CVE-2010-0034
KB 975416 no known exploits. Severity:Critical
Exploitability: 2,1,1,1,1,1
Critical Important
MS10-005 Vulnerability in Microsoft Paint Could Allow Remote Code Execution
Microsoft Paint
CVE-2010-0028
KB 978706 no known exploits. Severity:Moderate
Exploitability: 2
Critical Moderate
MS10-006 Vulnerabilities in SMB Client Could Allow Remote Code Execution (Replaces MS06-030 MS08-068 )
SMB
CVE-2010-0016
CVE-2009-0017
KB 978251 no known exploits. Severity:Critical
Exploitability: 2,1
Critical Critical
MS10-007 Vulnerability in Windows Shell Handler Could Allow Remote Code Execution
ShellExecute API
CVE-2010-0027
KB 975713 no known exploits. Severity:Critical
Exploitability: 1
Critical Important
MS10-008 Cumulative Security Update of ActiveX Kill Bits (Replaces MS09-055)
ActiveX
CVE-2010-0252
KB 978262 no known exploits. Severity:Critical
Exploitability: ?
Critical Important
MS10-009 Vulnerabilities in Windows TCP/IP Could Allow Remote Code Execution
IPv6
CVE-2010-0239
CVE-2010-0240
CVE-2010-0241
CVE-2010-0242
KB 974145 no known exploits. Severity:Critical
Exploitability: 2,2,2,3
Critical Critical
MS10-010 Hyper-V Instruction Set Validation Vulnerability
Hyper-V
CVE-2010-0026
KB 977894 no known exploits. Severity:Important
Exploitability: 3
Important Important
MS10-011 Vulnerability in Windows Client/Server Run-time Subsystem Could Allow Elevation of Privileges
CSRSS
CVE-2010-0023
KB 978037 no known exploits. Severity:Important
Exploitability: 1
Important Important
MS10-012 Vulnerabiliites in SMB Server Could Allow Remote Code Execution (Replaces MS09-001)
SMB Server
CVE-2010-0020
CVE-2010-0021
CVE-2010-0022
CVE-2010-0231
KB 971468 no known exploits. Severity:Important
Exploitability: 2,2,3,1
Important Critical
MS10-013 Vulnerability in Microsoft DirectShow Could Allow Remote Code Execution MS09-038 (Replaces MS09-038 MS09-028 )
DirectShow
CVE-2010-0250
KB 977935 no known exploits. Severity:Critical
Exploitability: 1
Critical Important
MS10-014 Vulnerability in Kerberos Could Allow Denial of Service
Kerberos
CVE-2010-0035
KB 977290 no known exploits. Severity:Important
Exploitability: 3
Important Important
MS10-015 Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege
Windows Kernel
CVE-2010-0232
CVE-2010-0233
KB 977165 exploit available Severity:Important
Exploitability: 1,2
Important Important
We will update issues on this page for about a week or so as they evolve.
We appreciate updates
US based customers can call Microsoft for free patch related support on 1-866-PCSAFETY
(*): ISC rating
  • We use 4 levels:
    • PATCH NOW: Typically used where we see immediate danger of exploitation. Typical environments will want to deploy these patches ASAP. Workarounds are typically not accepted by users or are not possible. This rating is often used when typical deployments make it vulnerable and exploits are being used or easy to obtain or make.
    • Critical: Anything that needs little to become "interesting" for the dark side. Best approach is to test and deploy ASAP. Workarounds can give more time to test.
    • Important: Things where more testing and other measures can help.
    • Less Urgent: Typically we expect the impact if left unpatched to be not that big a deal in the short term. Do not forget them however.
  • The difference between the client and server rating is based on how you use the affected machine. We take into account the typical client and server deployment in the usage of the machine and the common measures people typically have in place already. Measures we presume are simple best practices for servers such as not using outlook, MSIE, word etc. to do traditional office or leisure work.
  • The rating is not a risk analysis as such. It is a rating of importance of the vulnerability and the perceived or even predicted threat for affected systems. The rating does not account for the number of affected systems there are. It is for an affected system in a typical worst-case role.
  • Only the organization itself is in a position to do a full risk analysis involving the presence (or lack of) affected systems, the actually implemented measures, the impact on their operation and the value of the assets involved.
  • All patches released by a vendor are important enough to have a close look if you use the affected systems. There is little incentive for vendors to publicize patches that do not have some form of risk to them

------
Johannes B. Ullrich, Ph.D.
SANS Technology Institute
Twitter
IPv6 Fundamentals: IPv6 Security Training

 

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Oracle has an unscheduled security alert and patch for CVE-2010-0073. The issue affects WebLogic Server and is remotely exploitable. Details and patch are here http://www.oracle.com/technology/deploy/security/alerts/alert-cve-2010-0073.html

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