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Bug #1478

IMSI DETACH DoS

Added by admin almost 4 years ago. Updated 3 months ago.

Status:
New
Priority:
High
Assignee:
-
Category:
Um (MS-BTS) interface
Target version:
-
Start date:
Due date:
% Done:

0%

Resolution:
Spec Reference:

Description

In GSM networks that use the IMSI ATTACH/DETACH procedure, the IMSI DETACH message is not authenticated.

A malicious attacker knowing the IMSI or TMSI of a victim can thus send hand-crafted IMSI DETACH messages to a cell, causing the network to assume the MS is no longer present in the network.

This will effectively prevent the delivery of all mobile-terminated (MT) services, such as SMS, voice calls, CSD, ...

This flaw was first discovered in May 2010 by Sylvain Munaut.

History

#1 Updated by admin over 9 years ago

  • Status changed from New to In Progress

#2 Updated by steve-m over 8 years ago

This issue has also been covered at the "GSM and 3G Security"-talk at Blackhat Asia in April 2001.

See page 9 of the slides of the talk, "De-registration spoofing":
http://www.blackhat.com/presentations/bh-asia-01/gadiax.ppt

#3 Updated by laforge almost 4 years ago

  • Assignee deleted (laforge)

#4 Updated by Sweely 3 months ago

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