发布日期：2004-04-13
更新日期：2004-04-19

受影响系统：

Microsoft Windows XP
Microsoft Windows NT 4.0
Microsoft Windows 2003
Microsoft Windows 2000

描述：

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BUGTRAQ  ID: 10118
CVE(CAN) ID: CVE-2004-0123

Microsoft Windows是一款微软开发的操作系统。

Microsoft Windows实现的ASN.1库存在问题，远程攻击者可以利用这个漏洞在ASN.1库里的两次释放条件而以系统权限执行任意指令。

Abstract Syntax Notation 1 (ASN.1)是用于多个应用程序和设备的数据标准，允许数据可在各种平台传递。Microsoft ASN.1库广泛使用在Windows安全子系统，包含kerberos、NTLMv2验证，及使用各种证书的应用程序(SSL、EMAIL数字签名、ActiveX控件签名)。

通过传递特殊构建编码的ASN.1值给msasn1库导出的ASN1BERDecZeroCharString函数，可引起两次释放堆内存，精心构建提交数据可能以系统权限执行任意指令。

此漏洞可在SMB协议，MS RPC和HTTP等协议中触发。

<*来源：Foundstone Labs （labs@foundstone.com）
  
  链接：http://www.foundstone.com/products/sa/fs-sa-04-13-04.pdf
        http://www.microsoft.com/technet/security/bulletin/MS04-011.mspx
*>

建议：

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厂商补丁：

Microsoft
---------
Microsoft已经为此发布了一个安全公告（MS04-011）以及相应补丁:
MS04-011：Security Update for Microsoft Windows (835732)
链接：http://www.microsoft.com/technet/security/bulletin/MS04-011.mspx

补丁下载：

Microsoft Windows NT? Workstation 4.0 Service Pack 6a

http://www.microsoft.com/downloads/details.aspx?FamilyId=7F1713FC-F95C-43E5-B825-3CF72C1A0A3E&displaylang=en

Microsoft Windows NT Server 4.0 Service Pack 6a

http://www.microsoft.com/downloads/details.aspx?FamilyId=67A6F461-D2FC-4AA0-957E-3B8DC44F9D79&displaylang=en

Microsoft Windows NT Server 4.0 Terminal Server Edition Service Pack 6

http://www.microsoft.com/downloads/details.aspx?FamilyId=62CBA527-A827-4777-8641-28092D3AAE4F&displaylang=en

Microsoft Windows 2000 Service Pack 2, Microsoft Windows 2000 Service Pack 3, and Microsoft Windows 2000 Service Pack 4

http://www.microsoft.com/downloads/details.aspx?FamilyId=0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=en

Microsoft Windows XP and Microsoft Windows XP Service Pack 1

http://www.microsoft.com/downloads/details.aspx?FamilyId=3549EA9E-DA3F-43B9-A4F1-AF243B6168F3&displaylang=en

Microsoft Windows XP 64-Bit Edition Service Pack 1

http://www.microsoft.com/downloads/details.aspx?FamilyId=C6B55EF2-D9FE-4DBE-AB7D-73A20C82FF73&displaylang=en

Microsoft Windows XP 64-Bit Edition Version 2003

http://www.microsoft.com/downloads/details.aspx?FamilyId=C207D372-E883-44A6-A107-6CD2D29FC6F5&displaylang=en

Microsoft Windows Server 2003

http://www.microsoft.com/downloads/details.aspx?FamilyId=EAB176D0-01CF-453E-AE7E-7495864E8D8C&displaylang=en

Microsoft Windows Server 2003 64-Bit Edition

http://www.microsoft.com/downloads/details.aspx?FamilyId=C207D372-E883-44A6-A107-6CD2D29FC6F5&displaylang=en

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