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Vulnerability of Cisco IP Phone 8800: directory traversal via SIP Web Management Interface File Upload

Synthesis of the vulnerability 

An attacker can traverse directories via SIP Web Management Interface File Upload of Cisco IP Phone 8800, in order to write a file outside the service root path.
Impacted products: Cisco IP Phone.
Severity of this bulletin: 3/4.
Creation date: 21/03/2019.
Références of this threat: cisco-sa-20190320-ipptv, CSCvn56213, CSCvo57138, CVE-2019-1765, VIGILANCE-VUL-28797.

Description of the vulnerability 

An attacker can traverse directories via SIP Web Management Interface File Upload of Cisco IP Phone 8800, in order to write a file outside the service root path.
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This security weakness impacts software or systems such as Cisco IP Phone.

Our Vigil@nce team determined that the severity of this threat bulletin is important.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this threat.

Solutions for this threat 

Cisco IP Phone 8800: solution CSCvn56213 CSCvo57138.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn56213
  https://tools.cisco.com/bugsearch/bug/CSCvn56213
  https://tools.cisco.com/quickview/bug/CSCvn56213
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo57138
  https://tools.cisco.com/bugsearch/bug/CSCvo57138
  https://tools.cisco.com/quickview/bug/CSCvo57138
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