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Microsoft ActiveSync Denial of Service and Equipment ID Enumeration
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Secunia Advisory:
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SA16283
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Release Date:
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2005-08-02
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Last Update:
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2005-08-05
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Popularity:
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7,550 views
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Critical:
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Less critical
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Impact:
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Security Bypass
Exposure of system information
Exposure of sensitive information
DoS
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Where:
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From local network
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Solution Status:
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Unpatched
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| Software: | Microsoft ActiveSync 3.x
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Description:
Some vulnerabilities have been reported in Microsoft ActiveSync, which can be exploited by malicious people to cause a DoS (Denial of Service), enumerate valid equipment IDs or bypass certain security restrictions.
1) It is possible to enumerate valid equipment IDs by examining the response via some specially crafted data sent to port 5679/tcp.
This can further be exploited to trick users into disclosing passwords for mobile devices to malicious people.
2) An error in the communication handling can be exploited to freeze the ActiveSync process by sending multiple initialization requests to port 5679/tcp.
3) ActiveSync does not enforce password authentication when network synchronisation is performed. This can be exploited to cause to a PDA to sync with a malicious ActiveSync server or by a malicious PDA to access a ActiveSync server using partnership IDs sniffed from the network.
The vulnerabilities have been reported in version 3.7.1. #3 is reported in version 3.8. Other versions may also be affected.
Solution:
Restrict traffic to port 5679/tcp.
Use network synchronisation only when connected to a trusted network.
Provided and/or discovered by:
1-2) Seth Fogie, Airscanner Mobile Security.
3) Natalia Melnikova
Changelog:
2005-08-05: Added information provided by Natalia Melnikova.
Original Advisory:
http://www.airscanner.com/security/activesync371.htm
http://www.security.nnov.ru/Jdocument358.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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