Vulnerability identifier: #VU8918

Vulnerability risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12310

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Spark Hybrid Calendar Service
Client/Desktop applications / Other client software

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The weakness exists in the auto discovery phase of Cisco Spark Hybrid Calendar Service because an unencrypted HTTP request is made due to requirements for implementing the Hybrid Calendar service. A remote attacker can view sensitive information in the unencrypted headers of an HTTP method request and access sensitive customer data belonging to Office365 users, such as email and calendar events.

Mitigation
Update to version 1.0.4486.

Vulnerable software versions

Cisco Spark Hybrid Calendar Service: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171023-spark

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.