'detection'에 해당되는 글 3건

  1. 2012.03.19 MS12-020 RDP vulnerabilities: Patch, Mitigate, Detect
  2. 2010.09.13 XArp - Advanced ARP Spoofing Detection
  3. 2010.05.31 SQL Injection and Signature Evasion
2012.03.19 18:50

MS12-020 RDP vulnerabilities: Patch, Mitigate, Detect

As a follow up to the fact the we've raised the INFOCON level to yellow for MS12-020, a step not taken lightly, it was suggested that we offer a few simple things folks can do to ensure that they're patched appropriately, as well as employ possible mitigations and detection.

Specifically, MS12-020 includes KB2671387 (Remote Code Execution - CVE-2012-0002) and KB2667402(Denial of Service - CVE-2012-0152) or KB2621440
The reference for the update you'll see on a Windows system, when installed, depends on the version of the OS you're running. For Windows 7 you'll likely note KB2667402, whereas you should only expect KB2621440 on a Windows XP host.
Confusing, I know, but it matters. Read the full MS12-020 bulletin to confirm.
 
The simplest step to determine if you're properly updated, using Window 7 x64 as an example is: 
Start -> All Programs -> Windows Update -> View Update History and look for reference to KB2667402 as seen in Figure 1.
 

Figure 1 
 
If on a Windows XP host, using Microsoft Update, you can opt for Start -> Microsoft Update -> Review your update history and ensure KB2621440 is installed.
 
Additionally, at the command prompt, you can use Windows Management Instrumentation Command-line (WMIC) and issue:
wmic qfe | find "KB2667402" or wmic qfe | find "KB2621440"
If patched you'll note results as seen in Figure 2.
 

Figure 2
 
Mitigation
Per the bulletins, "systems that do not have RDP enabled are not at risk."
Your privileges on a given system (enterprise GPOs may prevent changes) may dictate your level of success.
Options include, aside from the obvious (PATCH):
1) Don't run RDP if you don't really need it.
Start -> Run -> services.msc -> Stop and/or disable Remote Desktop Services (Figure 3) or disable it via Control Panel

Figure 3
 
2) Use Windows Firewall (where applicable and if enabled) to prevent access to RDP (Figure 4)at the host level

Figure 4
 
3) Ensure your network security configurations don't unnecessarily allow RDP (TCP 3389) from the Internet. If you absolutely, positively must do so, restrict it to approved hosts.
 
4) Enable Network Level Authentication (NLA) on Vista and later systems. Per the SRD blog: "On systems with NLA enabled, the vulnerable code is still present and could potentially be exploited for code execution. However, NLA would require an attacker to first authenticate to the server before attempting to exploit the vulnerability."
  
Detection
Snort users can keep an eye on the likes of Emerging Threats. A rule (SID 2014384) has been included to identify a possible RDP DoS attack as described in KB2667402/CVE-2012-0152. I'm certain additional rules and detection logic are being added across the spectrum of detection options; check in with your vendor/provider accordingly.
 
Feel free to comment with methodology related to the above that works for you and thus may help others.


출처 : isc.sans.edu

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2010.09.13 15:49

XArp - Advanced ARP Spoofing Detection

모니터링을 통해 ARP Spoofing 공격 여부를 탐지하여 보안에 활용 가능한 간단한 툴입니다.

네트워크 공격의 80%가 네트워크 내부에서 발생합니다.





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2010.05.31 19:02

SQL Injection and Signature Evasion

SQL-Injection: Attack-Types






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