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Cisco PSIRT – Notice about public exploitation of the Cisco ASA Clientless SSL VPN Portal Customization Integrity Vulnerability

Cisco PSIRT is aware of public exploitation of the Cisco ASA Clientless SSL VPN Portal Customization Integrity Vulnerability identified by Cisco bug ID CSCup36829 (registered customers only) and CVE ID CVE-2014-3393. This vulnerability was disclosed on the 8th of October 2014 in the Cisco Security Advisory: Multiple Vulnerabilities in Cisco ASA Software.

All customers that have customizations applied to their Clientless SSL VPN portal and regardless of the Cisco ASA Software release in use should review the security advisory and this blog post for additional remediation actions.

NOTE: The Cisco Security Advisory: Multiple Vulnerabilities in Cisco ASA Software should be used as the Single Source of Truth (SSoT) for all details of this vulnerability and for any revisions of information going forward. Read More »

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Cisco 2015 Annual Security Report: Java on the Decline as Attack Vector

As recently as 2013, vulnerabilities involving Java appeared to be a favored tool of adversaries: Java was easy to exploit and, and exploits involving the programming language were difficult to detect. However, as reported in the Cisco 2015 Annual Security Report, Java is losing its front-runner position as a favored tool of bad actors looking to breach network security.

The decline in Java’s high profile as an attack vector in 2014 was recorded by Cisco Security Research. Only one of the top 10 most commonly exploited vulnerabilities in 2014 was related to Java (see chart below). In 2013, Cisco tracked 54 urgent new Java vulnerabilities; in 2014, the number of tracked vulnerabilities fell to just 19. We saw a corresponding decline in reports from the National Vulnerability Database (NVD), which includes all reported vulnerabilities: from 309 Java vulnerabilities in 2013, down to 253 in 2014.

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CVE-2015-0235: A GHOST in the Machine

This post was authored by Nick BiasiniEarl Carter, Alex Chiu and Jaeson Schultz

On Tuesday January 27, 2015, security researchers from Qualys published information concerning a 0-day vulnerability in the GNU C library. The vulnerability, known as “GHOST” (a.k.a. CVE-2015-0235), is a buffer overflow in the __nss_hostname_digits_dots() function. As a proof-of-concept, Qualys has detailed a remote exploit for the Exim mail server that bypasses all existing protections, and results in arbitrary command execution. Qualys intends to release the exploit as a Metasploit module.

CVE-2015-0235 affects the functions gethostbyname() and gethostbyname2() –functions originally used to resolve a hostname to an IP address. However, these functions have been deprecated for approximately fifteen years, largely because of their lack of support for IPv6.  The superseding function is getaddrinfo() which does support IPv6 and is not affected by this buffer overflow.  Programs that still utilize the deprecated gethostbyname() and gethostbyname2() functions may potentially be affected by GHOST.

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CVSS Version 3 Available For Public Comments

The Common Vulnerability Scoring System (CVSS) Special Interest Group (SIG), in which Cisco is an active participant, acting on behalf of FIRST.org, has published a preview of the upcoming CVSS v3.0 scoring standard.  The CVSS v3.0 preview represents a near final version and includes metric and vector strings, formulas, scoring examples and a v3.0 calculator – all available at the CVSS v3.0 development site. The official public comment period is scheduled to end February 28, 2015 and anyone who produces or consumes CVSS scores are encouraged to review and provide feedback to cvss-v3-comments@first.org by the close of the comment period.

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Ancient Mac Site Harbors Botnet that Exploits IE Vulnerability

This post was authored by Alex Chiu and Shaun Hurley.

Last month, Microsoft released a security bulletin to patch CVE-2014-6332, a vulnerability within Windows Object Linking and Embedding (OLE) that could result in remote code execution if a user views a maliciously crafted web page with Microsoft Internet Explorer. Since then, there have been several documented examples of attackers leveraging this vulnerability and attempting to compromise users. On November 26th, Talos began observing and blocking an attack disguised as a hidden iframe on a compromised domain to leverage this vulnerability and compromise Internet Explorer users.

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