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Vulnerability of Cisco IP Phone SPAx: privilege escalation via Certificate Validation

Synthesis of the vulnerability 

An attacker can bypass restrictions via Certificate Validation of Cisco IP Phone SPAx, in order to escalate his privileges.
Vulnerable systems: Cisco IP Phone.
Severity of this threat: 2/4.
Creation date: 21/02/2019.
Références of this weakness: CERTFR-2019-AVI-073, cisco-sa-20190220-ipphone-certs, CSCvm49157, CSCvn17125, CSCvn17128, CVE-2019-1683, VIGILANCE-VUL-28574.

Description of the vulnerability 

An attacker can bypass restrictions via Certificate Validation of Cisco IP Phone SPAx, in order to escalate his privileges.
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This security alert impacts software or systems such as Cisco IP Phone.

Our Vigil@nce team determined that the severity of this security weakness is medium.

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

An attacker with a expert ability can exploit this security announce.

Solutions for this threat 

Cisco IP Phone SPAx: solution CSCvm49157 CSCvn17125 CSCvn17128.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm49157
  https://tools.cisco.com/bugsearch/bug/CSCvm49157
  https://tools.cisco.com/quickview/bug/CSCvm49157
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn17125
  https://tools.cisco.com/bugsearch/bug/CSCvn17125
  https://tools.cisco.com/quickview/bug/CSCvn17125
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn17128
  https://tools.cisco.com/bugsearch/bug/CSCvn17128
  https://tools.cisco.com/quickview/bug/CSCvn17128
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