Cisco Spark Hybrid Calendar Service Auto Discovery HTTP Request information disclosure

Summaryinfo

A vulnerability marked as problematic has been reported in Cisco Spark Hybrid Calendar Service. Affected by this issue is some unknown functionality of the component Auto Discovery. This manipulation as part of HTTP Request causes information disclosure. This vulnerability is registered as CVE-2017-12310. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in Cisco Spark Hybrid Calendar Service (Calendar Software) (the affected version is unknown) and classified as problematic. Affected by this vulnerability is an unknown code of the component Auto Discovery. The manipulation as part of a HTTP Request leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

A vulnerability in the auto discovery phase of Cisco Spark Hybrid Calendar Service could allow an unauthenticated, remote attacker to view sensitive information in the unencrypted headers of an HTTP method request. The attacker could use this information to conduct additional reconnaissance attacks leading to the disclosure of sensitive customer data. The vulnerability exists in the auto discovery phase because an unencrypted HTTP request is made due to requirements for implementing the Hybrid Calendar service. An attacker could exploit this vulnerability by monitoring the unencrypted traffic on the network. An exploit could allow the attacker to access sensitive customer data belonging to Office365 users, such as email and calendar events. Cisco Bug IDs: CSCvg35593.

The bug was discovered 10/23/2017. The weakness was published 03/27/2018 as cisco-sa-20171023-spark as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2017-12310 since 08/03/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/17/2020). MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 155 days. During that time the estimated underground price was around $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Calendar Software

Vendor

• Cisco

Name

• Spark Hybrid Calendar Service

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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