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Microsoft Security Bulletin MS02-151: Cryptographic Flaw in RDP Protocol can Lead to Information Disclosure (Q324380) | |
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| Time: 08:05 EST/13:05 GMT | News Source: ActiveWin.com | Posted By: Todd Richardson | ||
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The first involves how session encryption is implemented in certain versions of RDP. All RDP implementations allow the data in an RDP session to be encrypted. However, in the versions in Windows 2000 and Windows XP, the checksums of the plaintext session data are sent without being encrypted themselves. An attacker who was able to eavesdrop on and record an RDP session could conduct a straightforward cryptanalytic attack against the checksums and recover the session traffic.
The second involves how the RDP implementation in Windows XP handles data packets that are malformed in a particular way. Upon receiving such packets, the Remote Desktop service would fail, and with it would fail the operating system. It would not be necessary for an attacker to authenticate to an affected system in order to deliver packets of this type to an affected system.
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