[SA16283] Microsoft ActiveSync Denial of Service and Equipment ID Enumeration

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TITLE:
Microsoft ActiveSync Denial of Service and Equipment ID Enumeration

SECUNIA ADVISORY ID:
SA16283

VERIFY ADVISORY:
http://secunia.com/advisories/16283/

CRITICAL:
Less critical

IMPACT:
Exposure of system information, Exposure of sensitive information,
DoS

WHERE:
>From local network

SOFTWARE:
Microsoft ActiveSync 3.x
http://secunia.com/product/1310/

DESCRIPTION:
Seth Fogie has reported two vulnerabilities in Microsoft ActiveSync,
which can be exploited by malicious people to cause a DoS (Denial of
Service) and enumerate valid equipment IDs.

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.

The vulnerabilities have been reported in version 3.7.1. Other
versions may also be affected.

SOLUTION:
Restrict traffic to port 5679/tcp.

PROVIDED AND/OR DISCOVERED BY:
Seth Fogie, Airscanner Mobile Security.

ORIGINAL ADVISORY:
http://www.airscanner.com/security/activesync371.htm

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