Security Experts:

Connect with us

Hi, what are you looking for?

SecurityWeekSecurityWeek

Network Security

Cisco Patches Critical Code Execution Flaw in Security Appliances

Cisco informed customers on Monday that updates released for its Adaptive Security Appliance (ASA) software patch a critical vulnerability that can be exploited to gain full control of devices or cause them to reload.

Cisco informed customers on Monday that updates released for its Adaptive Security Appliance (ASA) software patch a critical vulnerability that can be exploited to gain full control of devices or cause them to reload.

The security hole, tracked as CVE-2018-0101 and assigned a CVSS score of 10, allows a remote and unauthenticated attacker to execute arbitrary code or cause a denial-of-service (DoS) condition.

The flaw exists in the Secure Sockets Layer (SSL) VPN functionality of the ASA software. If this “webvpn” feature is enabled on a device, an attempt to double free a memory region occurs. A remote attacker can trigger the bug by sending specially crafted XML packets to a webvpn-configured interface.

Several security appliances using ASA software are affected, including 3000 Series Industrial Security Appliances (ISA), ASA 5500 security appliances and firewalls, ASA services modules for Catalyst 6500 series switches and 7600 series routers, ASA cloud firewalls, ASAv virtual appliances, and various Firepower devices.

Cisco has released fixes for each of the affected ASA releases, except for ones that are no longer supported.

Cisco is not aware of any malicious attacks exploiting this flaw, but its product security incident response team (PSIRT) “is aware of public knowledge of the vulnerability.”

Cedric Halbronn, the NCC Group researcher who reported the weakness to Cisco, will disclose its details on February 2 at the Recon Brussels 2018 conference.

Researchers at NCC Group have been investigating Cisco ASA devices and their firmware, and they have released a series of tools and blog posts dedicated to analyzing ASA firmware and finding vulnerabilities.

The experts started analyzing Cisco’s ASA software following the discovery of two critical vulnerabilities back in 2016, namely the IKEv1/IKEv2 buffer overflow tracked as CVE-2016-1287, and CVE-2016-6366, which Cisco identified following the release of an Equation Group exploit by the Shadow Brokers hacker group.

Related: Cisco Fixes Serious Flaws in Security, Other Products

Related: Cisco Patches Flaws in Email Security, Other Products

Related: Critical Flaw Exposes Cisco Collaboration Products to Hacking

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Expert Insights

Related Content

Network Security

NSA publishes guidance to help system administrators identify and mitigate cyber risks associated with transitioning to IPv6.

Cyberwarfare

Websites of German airports, administration bodies and banks were hit by DDoS attacks attributed to Russian hacker group Killnet

Mobile & Wireless

Technical details published for an Arm Mali GPU flaw leading to arbitrary kernel code execution and root on Pixel 6.

Mobile & Wireless

Apple rolled out iOS 16.3 and macOS Ventura 13.2 to cover serious security vulnerabilities.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

Mobile & Wireless

Apple’s iOS 12.5.7 update patches CVE-2022-42856, an actively exploited vulnerability, in old iPhones and iPads.

Identity & Access

Hackers rarely hack in anymore. They log in using stolen, weak, default, or otherwise compromised credentials. That’s why it’s so critical to break the...

Vulnerabilities

Security researchers have observed an uptick in attacks targeting CVE-2021-35394, an RCE vulnerability in Realtek Jungle SDK.