Microsoft Security Bulletin MS02-051

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News del 19 Settembre 02 Autore: Steve3000
Cryptographic Flaw in RDP Protocol can Lead to Information Disclosure (Q324380) - ---------------------------------------------------------------------- Title: Cryptographic Flaw in RDP Protocol can Lead to Information Disclosure (Q324380) Released: 18 September 2002 Software: Microsoft Windows 2000 Microsoft Windows XP Impact: Two vulnerabilities: information disclosure, denial of service Max Risk: Moderate Bulletin: MS02-051 Microsoft encourages customers to review the Security Bulletin at: - ---------------------------------------------------------------------- Issue: ====== The Remote Data Protocol (RDP) provides the means by which Windows systems can provide remote terminal sessions to clients. The protocol transmits information regarding a terminal sessions' keyboard, mouse and video to the remote client, and is used by Terminal Services in Windows NT 4.0 and Windows 2000, and by Remote Desktop in Windows XP. Two security vulnerabilities, both of which are eliminated by this patch, have been discovered in various RDP implementations. 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 straight- forward 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. ---------------------------------Patch Windows 2000, localizzata in Italiano - Q324380_W2K_SP4_X86_IT.exeWindows XP, localizzata in Inglese - Q324380_WXP_SP1_x86_ENU.exe - 284 KbWindows XP (64-bit), localizzata in Inglese - Q324380_WXP_SP1_ia64_ENU.exe - 536 Kb
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