Cisco ASA XML Parser input validation

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6.5$0-$5k0.00

A vulnerability was found in Cisco ASA (Firewall Software) (the affected version unknown). It has been rated as critical. Affected by this issue is an unknown part of the component XML Parser. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability.

The weakness was disclosed 04/08/2015 with Cisco as cisco-sa-20150408-asa as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability is handled as CVE-2015-0677 since 01/07/2015. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The advisory points out:

A vulnerability in the XML parser of Cisco ASA Software could allow an unauthenticated, remote attacker to cause a crash of the WebVPN component that could lead to the reset of all SSL VPN connections, system instability, and a reload of the affected system. The vulnerability is due to insufficient hardening of the XML parser configuration. An attacker could exploit this vulnerability by sending a crafted XML message to the affected system. This vulnerability affects Cisco ASA appliances configured for Clientless or AnyConnect SSL VPN and AnyConnect IKEv2 VPN. All other VPN configurations are unaffected by this vulnerability.

The vulnerability scanner Nessus provides a plugin with the ID 82852 , which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 43469 (Cisco ASA Multiple Vulnerabilities (cisco-sa-20150408-asa)).

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the databases at X-Force (102088), Tenable (82852), SecurityFocus (BID 73967†), SecurityTracker (ID 1032045†) and Vulnerability Center (SBV-49430†). The entries VDB-74670 and VDB-74671 are pretty similar.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
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CVSSv2info

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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Nessus ID: 82852
Nessus File: 🔍
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OpenVAS ID: 800316
OpenVAS Name: Cisco ASA VPN XML Parser DoS Vulnerability
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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0-Day Time: 🔍

Timelineinfo

01/07/2015 🔍
04/08/2015 +91 days 🔍
04/08/2015 +0 days 🔍
04/08/2015 +0 days 🔍
04/08/2015 +0 days 🔍
04/09/2015 +1 days 🔍
04/09/2015 +0 days 🔍
04/12/2015 +3 days 🔍
05/02/2022 +2577 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20150408-asa
Organization: Cisco
Status: Confirmed

CVE: CVE-2015-0677 (🔍)
X-Force: 102088 - Cisco ASA XML parser denial of service
SecurityFocus: 73967 - Cisco Adaptive Security Appliance (ASA) Software CVE-2015-0677 Denial of Service Vulnerability
SecurityTracker: 1032045 - Cisco ASA Bugs Let Remote Users Execute Arbitrary Commands and Deny Service
Vulnerability Center: 49430 - [cisco-sa-20150408-asa] Cisco ASA Remote DoS via a Crafted XML Message - CVE-2015-0677, High

See also: 🔍

Entryinfo

Created: 04/09/2015 10:34 AM
Updated: 05/02/2022 09:12 PM
Changes: 04/09/2015 10:34 AM (65), 06/25/2017 08:31 AM (13), 05/02/2022 09:04 PM (3), 05/02/2022 09:12 PM (1)
Complete: 🔍
Cache ID: 18:607:40

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