Microsoft Windows DHCP Client Service Remote Buffer Overflow

Risk: High
Local: No
Remote: Yes
CWE: CWE-119

CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 (The following advisory is also available in PDF format for download at: s_DHCP_Client_Service_Remote_Buffer_Overflow.pdf ) CYBSEC S.A. Pre-Advisory Name: Microsoft Windows DHCP Client Service Remote Buffer Overflow ================== Vulnerability Class: Buffer Overflow ==================== Release Date: 07/11/2006 ============= Affected Platforms: =================== * Microsoft Windows 2000 (<= SP4) * Microsoft Windows XP (<= SP2) * Microsoft Windows 2003 (<= SP1) Local / Remote: Remote =============== Severity: High ========= Author: Mariano Nu&ntilde;ez Di Croce ======= Vendor Status: ============== * Confirmed, update released. Reference to Vulnerability Disclosure Policy: ============================================= Vulnerability Description: ========================== A remote buffer overflow vulnerability has been identified in Microsoft Windows DHCP-Client service. Technical Details: ================== Technical details will be released 30 days after publication of this pre-advisory. This was agreed upon with Microsoft to allow their customers to upgrade affected software prior to technical knowledge been publicly available. Impact: ======= Exploiting this vulnerability, an attacker would be able to execute code remotely with SYSTEM privileges over DHCP-enabled Microsoft Windows systems. Solutions: ========== Microsoft has released a hotfix to address this vulnerability. Customers should apply the hotfix immediately or upgrade their systems through Microsoft Windows Update system. Vendor Response: ================ * 12/26/2005: Initial Vendor Contact. * 01/19/2006: Vendor Confirmed Vulnerability. * 07/11/2006: Vendor Releases Update. * 07/11/2006: Pre-Advisory Public Disclosure. Contact Information: ==================== For more information regarding the vulnerability feel free to contact the author at mnunez {at} For more information regarding CYBSEC: (c) 2006 - CYBSEC S.A. Security Systems - -- - ------------------------------ Mariano Nu&ntilde;ez Di Croce CYBSEC S.A. Security Systems Email: mnunez (at) cybsec (dot) com [email concealed] Tel/Fax: (54-11) 4382-1600 Web: PGP: - ------------------------------ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFEs+e0bbZGNCayCJkRAtxlAJ4r6zKhP2Uv/Tq8YOoAErDXn9lc8wCfcy8W EMk1oIYCbhnNnm1PlElLpi8= =3ZFG -----END PGP SIGNATURE-----

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