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Cisco WebEx Meetings Server XML Injection

Cisco WebEx Meetings Server XML Injection
Posted Nov 5, 2018
Authored by Alphan Yavas

Cisco WebEx Meetings Server suffers from an XML external entity injection vulnerability.

tags | exploit
systems | cisco
advisories | CVE-2018-18895
SHA-256 | 39042e3cffbe45edd8d3a912b89bcc36d39e3f36f804bfcc34793db23f991d10

Cisco WebEx Meetings Server XML Injection

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I. VULNERABILITY
-------------------------
Cisco WebEx Meetings Server XML External Entity

II. CVE REFERENCE
-------------------------
CVE-2018-18895

III. VENDOR
-------------------------
http://cisco.com

IV. TIMELINE
------------------------
18/09/2018 Vulnerability discovered
19/09/2018 Vendor contacted
24/10/2018 Cisco replay that they will fix it.

V. CREDIT
-------------------------
Alphan Yavas from Biznet Bilisim A.S.

VI. DESCRIPTION
-------------------------
Cisco Webex Meetings Server includes a version of Castor XML that is
affected by XXE. Because of that Cisco WebEx Meetings Server prior to
versions 2.8MR3 and 3.0MR2 patch 1 are affected from XXE
vulnerability. A remote unauthenticated attacker may lead to the
disclosure of confidential data, denial of service, server side
request forgery, port scanning from the perspective of the machine
where the parser is located, and other system impacts by using this
vulnerability.

Vulnerable path: /WBXServixe/XMLService
Vulnerable parametre: siteName

VII. SOLUTION
-------------------------
Update current Cisco WebEx Meetings Server to 2.8MR3, 3.0MR2 patch 1,
or the upcoming 4.0 release.

VIII. REFERENCES
-------------------------
You can find Ciscoas announcement from the link below:
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm56811

You can find more information about XXE from the link below:
https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing

Castor XML fixed this issue with CVE-2014-3004.
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