Cisco Firepower System Software up to 6.2.2 SSL Policy cryptographic issue

Summaryinfo

A vulnerability identified as critical has been detected in Cisco Firepower System Software up to 6.2.2. This issue affects some unknown processing of the component SSL Policy Handler. This manipulation causes cryptographic issue. This vulnerability is handled as CVE-2017-6766. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Cisco Firepower System Software up to 6.2.2 (Firewall Software). It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component SSL Policy Handler. The manipulation with an unknown input leads to a cryptographic issue vulnerability. The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the Secure Sockets Layer (SSL) Decryption and Inspection feature of Cisco Firepower System Software 5.4.0, 5.4.1, 6.0.0, 6.1.0, 6.2.0, 6.2.1, and 6.2.2 could allow an unauthenticated, remote attacker to bypass the SSL policy for decrypting and inspecting traffic on an affected system. The vulnerability is due to unexpected interaction with Known Key and Decrypt and Resign configuration settings of SSL policies when the affected software receives unexpected SSL packet headers. An attacker could exploit this vulnerability by sending a crafted SSL packet through an affected device in a valid SSL session. A successful exploit could allow the attacker to bypass the SSL decryption and inspection policy for the affected system, which could allow traffic to flow through the system without being inspected. Cisco Bug IDs: CSCve12652.

The bug was discovered 08/02/2017. The weakness was released 08/07/2017 (Website). It is possible to read the advisory at quickview.cloudapps.cisco.com. This vulnerability is known as CVE-2017-6766 since 03/09/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/04/2019). The attack technique deployed by this issue is T1600 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 5 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.

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Productinfo

Type

• Firewall Software

Vendor

• Cisco

Name

• Firepower System Software

Version

• 5.4.0
• 5.4.1
• 6.0.0
• 6.1.0
• 6.2.0
• 6.2.1
• 6.2.2

License

• commercial

Website

• Vendor: https://www.cisco.com/

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