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ReviewHigh

CVE-2018-0227

Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense

A vulnerability in the Secure Sockets Layer (SSL) Virtual Private Network (VPN) Client Certificate Authentication feature for Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to establish an SSL VPN connection and bypass certain SSL certificate verification steps. The vulnerability is due to incorrect verification of the SSL Client Certificate. An attacker could exploit this vulnerability by connecting to the ASA VPN without a proper private key and certificate pair. A successful exploit could allow the attacker to establish an SSL VPN connection to th...

CVSS
7.5
EPSS
2.05%
79.9% percentile
CISA KEV
Not listed
Published
2018.04.20
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability2.05%
Technical severityCVSS 7.5

Vulnerability overview

A vulnerability in the Secure Sockets Layer (SSL) Virtual Private Network (VPN) Client Certificate Authentication feature for Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to establish an SSL VPN connection and bypass certain SSL certificate verification steps. The vulnerability is due to incorrect verification of the SSL Client Certificate. An attacker could exploit this vulnerability by connecting to the ASA VPN without a proper private key and certificate pair. A successful exploit could allow the attacker to establish an SSL VPN connection to th...

Affected product and versions

Product
Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense
Affected versions
>= Cisco Adaptive Security Appliance, >= 9.4.4 <= 9.4.4.13, >= 9.5.3.7 <= 9.5.3.9, >= 9.6.2.9 <= 9.6.2.21, >= 9.6.3 <= 9.6.3.17, 9.4.3.1, 9.4.3.2, 9.5.2.7, 9.5.2.8, >= 6.0 <= 6.0.1.4, >= 6.1.0 <= 6.1.0.5
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
CWE-295