Saturday, December 2, 2023

Cisco has Fixed a six-month-Old Zero-day Vulnerability Found in the Cisco AnyConnect

The Cisco Product Security Incident Response Team (PSIRT) has recently fixed a six-month-old zero-day vulnerability that is tracked as “CVE-2020-3556” in Cisco AnyConnect Security Client. 

This zero-day flaw allows any attackers to execute arbitrary code; so, the experts have strongly recommended all the users to update their client immediately.

AnyConnect is a VPN security client that was launched by Cisco, and the chief function of AnyConnect VPN is to expedite all its users (intending company employees) to work safely on any device. 

No matter where the user is, as it allows all its users to work as usual using the laptops, and mobile devices provided by the company. 

AnyConnect simplifies and secures the terminal access to provide the necessary security measures to guarantee the constant security of the company or organization.

However, in the AnyConnect Secure Mobility Client Software releases 4.10.00093, and later this six-month-old zero-day vulnerability has been addressed.

Flaw Profile

Here we have mentioned all the details of this six-month-old zero-day vulnerability:-

  • CVE ID: CVE-2020-3556
  • CWE ID: CWE-20
  • Advisory ID: cisco-sa-anyconnect-ipc-KfQO9QhK
  • Cisco Bug IDs: CSCvv30103
  • CVSS Score: 7.3
  • Severity: High

This zero-day vulnerability actually detected in the inter-process communication (IPC) channel of the Cisco AnyConnect Secure Mobility Client. And this vulnerability is caused by the lack of authentication of the IPC listener.

To exploit this flaw any threat actor can send a specially crafted IPC message to the AnyConnect client IPC listener and allow that attacker to trick the user into executing malicious scripts on the infected system.

Apart from this, the security analysts at Cisco affirmed that:-

  • On the laptops used by a single user, this flaw is not exploitable.
  • This flaw is not remotely exploitable.
  • This vulnerability is not a privilege elevation exploit.
  • This security flaw is rated as high severity, as this has the ability to exploit the configurations.

Vulnerable Products

  • AnyConnect Secure Mobility Client for Windows
  • AnyConnect Secure Mobility Client for macOS
  • AnyConnect Secure Mobility Client for Linux

Determine Vulnerability

Below we have mentioned the locations where you can check the presence of this flaw:-

  • Windows:<DriveLetter>:\ProgramData\Cisco\Cisco AnyConnect Secure Mobility Client\
  • macOS: /opt/cisco/anyconnect/
  • Linux: /opt/cisco/anyconnect/


As a security measure, the analysts have recommended all the users who cannot immediately install the security updates to turn off the Auto-Update feature.

Moreover, they have also urged users to disable the Enable Scripting configuration setting on the devices where this setting is enabled. As they claimed that by doing so will reduce the attack surface.

Apart from this, if anyone somehow won’t able to upgrade their older versions to the newer version with all the security fixes, for them to apply the recommended workarounds Cisco have also provided the detailed upgradation guide.

You can follow us on LinkedinTwitterFacebook for daily Cybersecurity and hacking news updates.


Latest articles

Active Attacks Targeting Google Chrome & ownCloud Flaws: CISA Warns

The CISA announced two known exploited vulnerabilities active attacks targeting Google Chrome & own...

Cactus Ransomware Exploiting Qlik Sense code execution Vulnerability

A new Cactus Ransomware was exploited in the code execution vulnerability to Qlik Sense...

Hackers Bypass Antivirus with ScrubCrypt Tool to Install RedLine Malware

The ScrubCrypt obfuscation tool has been discovered to be utilized in attacks to disseminate the RedLine Stealer...

Hotel’s Hacked Logins Let Attacker Steal Guest Credit Cards

According to a recent report by Secureworks, a well-planned and advanced phishing attack was...

Critical Zoom Vulnerability Let Attackers Take Over Meetings

Zoom, the most widely used video conferencing platform has been discovered with a critical...

Hackers Using Weaponized Invoice to Deliver LUMMA Malware

Hackers use weaponized invoices to exploit trust in financial transactions, embedding malware or malicious...

US-Seized Crypto Currency Mixer Used by North Korean Lazarus Hackers

The U.S. Treasury Department sanctioned the famous cryptocurrency mixer Sinbad after it was claimed...
BALAJI is an Ex-Security Researcher (Threat Research Labs) at Comodo Cybersecurity. Editor-in-Chief & Co-Founder - Cyber Security News & GBHackers On Security.

API Attack Simulation Webinar

Live API Attack Simulation

In the upcoming webinar, Karthik Krishnamoorthy, CTO and Vivek Gopalan, VP of Products at Indusface demonstrate how APIs could be hacked.The session will cover:an exploit of OWASP API Top 10 vulnerability, a brute force account take-over (ATO) attack on API, a DDoS attack on an API, how a WAAP could bolster security over an API gateway

Related Articles