June 9, 2023

Organizations using Pulse Secure’s mobile VPN should patch vulnerabilities reportedly being exploited in the wild, possibly by a “Chinese espionage actor”.

If the vulnerability is found, affected government Pulse Secure software and appliances have to be immediately isolated from the network and a full report has to be made. In addition to the vulnerability detection tool, Pulse Secure has issued a replacement XML configuration file, which prevents the exploits from functioning when placed on affected devices.

Organizations should examine available forensic evidence to determine if an attacker compromised user credentials.it’s highly recommends resetting all passwords in the environment and reviewing the configuration to ensure no service accounts can be used to authenticate to the vulnerability.”

Pulse Secure recommends using its online Pulse Connect Secure Integrity Assurance tool to determine whether Pulse Connect Secure software has been compromised.

The known exploits force the SSL VPN authentication system to reveal credentials and trick it into producing “successful login” results when checking those credentials. Several exploit techniques have been used, but the results have been compromised VPN appliances and remotely executed attack code.

The vulnerabilities are partially based on three known issues that were patched over the past two years, according to Pulse Secure’s own blog post on the matter. A newer flaw can allow an attacker to bypass two-factor authentication on the Pulse Secure Connect gateway and execute remote code. An exploit of that vulnerability has apparently been used by multiple groups to target U.S. defense and industrial networks.

There are twelve separate families of malware attacking Pulse Secure VPNs, and multiple actors are likely using the exploit in the wild at least one of which appears to be linked to the Chinese government.

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