Cisco ASA up to 9.0.3.6 Phone Proxy Untrusted Certificate input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
10.0	$25k-$100k	0.00

A vulnerability was found in Cisco ASA up to 9.0.3.6 (Firewall Software). It has been classified as very critical. Affected is an unknown function of the component Phone Proxy Untrusted Certificate Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The phone-proxy implementation in Cisco Adaptive Security Appliance (ASA) Software 9.0.3.6 and earlier does not properly validate X.509 certificates, which allows remote attackers to cause a denial of service (connection-database corruption) via an invalid entry, aka Bug ID CSCui33299.

The weakness was published 11/08/2013 as Cisco Adaptive Security Appliance Phone Proxy Database Entry Manipulation Vulnerability as confirmed advisory (Website). The advisory is available at tools.cisco.com. The public release has been coordinated with the vendor. This vulnerability is traded as CVE-2013-6682 since 11/07/2013. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 05/15/2017).

The commercial vulnerability scanner Qualys is able to test this issue with plugin 43347 (Cisco Adaptive Security Appliance (ASA) Phone Proxy Database Entry Manipulation Vulnerability).

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

The vulnerability is also documented in the vulnerability database at X-Force (88650). Further details are available at tools.cisco.com. Similar entry is available at 11129.

Productinfo

Type

Firewall Software

Vendor

Cisco

Name

Version

License

commercial

Support

end of life (old version)

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 10.0

VulDB Base Score: 10.0
VulDB Temp Score: 10.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/07/2013 🔍
11/08/2013 +1 days 🔍
11/08/2013 +0 days 🔍
11/12/2013 +4 days 🔍
11/13/2013 +1 days 🔍
11/15/2013 +2 days 🔍
11/25/2013 +10 days 🔍
05/15/2017 +1267 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: Cisco Adaptive Security Appliance Phone Proxy Database Entry Manipulation Vulnerability
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-6682 (🔍)
X-Force: 88650
Vulnerability Center: 42352 - Cisco ASA 9.0.3.6 and Previous Remote Security Bypass Vulnerability due to Improper Certificate Validation, Medium
SecurityFocus: 63624
Secunia: 55632 - Cisco Adaptive Security Appliance (ASA) Phone Proxy Process Certificate Verification Secur, Less Critical
OSVDB: 99557

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 11/15/2013 09:28
Updated: 05/15/2017 11:50
Changes: 11/15/2013 09:28 (46), 05/15/2017 11:50 (24)
Complete: 🔍

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