CVE-2009-3103
CVE-2009-3103 is a CWE-399 vulnerability in microsoft windows server 2008. 13 public exploit references exist, so weaponization risk is real. O3 Security detects and blocks CVE-2009-3103 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.
Array index error in the SMBv2 protocol implementation in srv2.sys in Microsoft Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold and SP2, and Windows 7 RC allows remote attackers…
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Description
Array index error in the SMBv2 protocol implementation in srv2.sys in Microsoft Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold and SP2, and Windows 7 RC allows remote attackers to execute arbitrary code or cause a denial of service (system crash) via an & (ampersand) character in a Process ID High header field in a NEGOTIATE PROTOCOL REQUEST packet, which triggers an attempted dereference of an out-of-bounds memory location, aka "SMBv2 Negotiation Vulnerability." NOTE: some of these details are obtained from third party information.
Affected Products
windows server 2008microsoftwindows vistamicrosoftResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Microsoft Windows - 'srv2.sys' SMB Negotiate ProcessID Function Table Dereference (MS09-050)
by Piotr Bania · Aug 17, 2010
Microsoft Windows 7/2008 R2 - Remote Kernel Crash
by laurent gaffie · Nov 11, 2009
Microsoft Windows Vista/7 - SMB2.0 Negotiate Protocol Request Remote Blue Screen of Death (MS07-063)
by laurent gaffie · Sep 9, 2009
Microsoft Windows - SMB2 Negotiate Protocol '0x72' Response Denial of Service
by Jelmer de Hen · May 7, 2010
Microsoft Windows - 'srv2.sys' SMB Negotiate ProcessID Function Table Dereference (MS09-050) (Metasploit)
by Metasploit · Jul 3, 2010
Microsoft Windows - 'srv2.sys' SMB Code Execution (Python) (MS09-050)
by ohnozzy · Feb 26, 2016
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every microsoft windows server 2008 deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.
Remediation status
No patch has shipped for CVE-2009-3103 yet — track the microsoft windows server 2008 advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.
How O3 protects you
O3 detects and blocks CVE-2009-3103 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.
Tailored to CVE-2009-3103. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2009-3103 being exploited in your environment?
O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2009-3103 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.