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Jul 29, 2021
UPDATE: PetitPotam NTLM Relay Attack
THE THREAT PetitPotam is a variant of the NTLM Relay attack discovered by security researcher Gilles Lionel. It is tracked as an authentication bypass vulnerability in Active Directory (Certificate Services); currently no CVE identifier has been assigned to this vulnerability. Proof of Concept (PoC) code released last week [1] relies on the Encrypting File System Remote (EFSRPC) protocol to…
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Security advisories — Jun 30, 2020

Palo Alto Networks SAML Vulnerability CVE-2020-2021

2 min read

THE THREAT:

On June 29th, 2020, Palo Alto announced an authentication-bypass vulnerability (CVE-2020-2021) affecting multiple PAN-OS versions used in VPN appliances and Firewalls [1]. The vulnerability affects Security Assertion Markup Language (SAML) authentication. If exploited, threat actors with unauthenticated network access may gain access to protected resources. Additionally, attackers with access to PAN-OS or Panorama web interfaces could perform administrative actions. The vulnerability has not been identified as being exploited in the wild at this time but attacks are expected in the immediate future, given the simplicity of exploitation [2].

What we’re doing about it

What you should do about it

Detailed instructions for upgrades and workarounds can be found here.

Additional information

Palo Alto devices are impacted if all of the following configurations are in place:

  1. Running an impacted version of PAN-OS (see below)
  2. SAML authentication is enabled
  3. “Validate Identity Provider Certificate” SAML configuration option is disabled.

Impacted PAN-OS versions (Source: Palo Alto Networks):

Vulnerable configurations of Security Assertion Markup Language (SAML) authentication on impacted PAN-OS devices could allow unauthenticated, network-based attacker to access protected resources.

In their advisory, Palo Alto Networks identified the following resources which can be protected by SAML:

For instructions on identifying vulnerable SAML configurations in PAN devices, see Palo Alto Networks’ advisory and associated knowledge base articles. Customers are encouraged to apply upgrades or workarounds as soon as possible.

References:

[1] https://security.paloaltonetworks.com/CVE-2020-2021

[2] https://twitter.com/CNMF_CyberAlert/status/1277674547542659074