CVE-2019-1579: Critical Pre-Authentication Vulnerability in Palo Alto Networks GlobalProtect SSL VPN Disclosed
Researchers disclose a critical vulnerability in Palo Alto GlobalProtect SSL VPN solution used by many organizations.
Background
On July 17, researchers Orange Tsai and Meh Chang published a blog about their discovery of a pre-authentication remote code execution (RCE) vulnerability in the Palo Alto Networks (PAN) GlobalProtect Secure Socket Layer (SSL) virtual private network (VPN) used by many organizations around the world.
التحليل
CVE-2019-1579 is a format string vulnerability in the PAN SSL Gateway, which handles client/server SSL handshakes. More specifically, the vulnerability exists because the gateway passes the value of a particular parameter to snprintf in an unsanitized, and exploitable, fashion. An unauthenticated attacker could exploit the vulnerability by sending a specially crafted request to a vulnerable SSL VPN target in order to remotely execute code on the system.
Though the researchers reported their findings to PAN, the company responded that the vulnerability had been identified internally and fixed, hence why no CVE identifier was assigned and why newer versions of GlobalProtect are not vulnerable.
From there, the researchers sought to identify whether any large organizations might be running a vulnerable version of GlobalProtect. They found that popular ride-hailing service, Uber, was running an unpatched version. They confirmed their exploit worked against Uber and reported their findings. Uber responded it did not use PAN SSL VPN as its “primary VPN” and that it was hosted on Amazon Web Services (AWS) and not a part of the organization’s “core infrastructure,” which mitigated some of the potential impact of this vulnerability.
We expect to see more incoming scans to identify organizations running vulnerable instances of the PAN SSL VPN in their environments.
Proof of concept
Tsai and Chang included a proof-of-concept (PoC) in their blog post, but it requires modification in order to work successfully. They also provided a command to help identify vulnerable GlobalProtect versions based on the login.css file (8.x) and a .gif file (7.x).
Vendor response
Since publication of Tsai and Chang’s blog, PAN has assigned a CVE identifier, CVE-2019-1579, and published a security advisory, PAN-SA-2019-0020, for it.
Solution
The following table contains information about vulnerable versions and fixed or non-vulnerable versions of the PAN-OS:
| Affected version | Fixed version |
|---|---|
| PAN-OS 7.1.18 and earlier | PAN-OS 7.1.19 and later |
| PAN-OS 8.0.11 and earlier | PAN-OS 8.0.12 and later |
| PAN-OS 8.1.2 and earlier | PAN-OS 8.1.3 and later |
This vulnerability does not impact PAN-OS 9.0.
Additionally, PAN-SA-2019-0020 provides mitigations for customers who cannot upgrade to a patched version. The company recommends updating to “content release 8173, or a later version” as well as ensuring threat prevention is “enabled and enforced on traffic that passes through the GlobalProtect portal and GlobalProtect Gateway interface.”
Identifying affected systems
A list of Nessus plugins to identify this vulnerability will appear here as they’re released.
الحصول على مزيد من المعلومات
- Disclosure Blog from Orange Tsai and Meh Chang
- Palo Alto Security Advisory: PAN-SA-2019-0020
- Mitre: CVE-2019-1579
Join Tenable's Security Response Team on the Tenable Community.
Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface.
Get a free 60-day trial of Tenable.io.
مقالات ذات صلة
Detecting Risky Third-party Drivers on Windows Assets
August 7, 2024Kernel-mode drivers are critical yet risky components of the Windows operating system. Learn about their functionality, the dangers they pose, and how Tenable's new plugins can help identify and mitigate vulnerabilities using community-driven resources like LOLDrivers.
Never Trust User Inputs -- And AI Isn't an Exception: A Security-First Approach
August 6, 2024As AI transforms industries, security remains critical. Discover the importance of a security-first approach in AI development, the risks of open-source tools, and how Tenable's solutions can help protect your systems.
EPSS Shows Strong Performance in Predicting Exploits, Says Study from Cyentia and FIRST
July 30, 2024Tenable sponsored research from Cyentia and FIRST, which finds that while vulnerability exploitation is highly variable, EPSS is getting stronger in its ability to predict exploitation.
SSRFing the Web with the Help of Copilot Studio
August 20, 2024Tenable Research discovered a critical information-disclosure vulnerability in Microsoft’s Copilot Studio via a server-side request forgery (SSRF), which allowed researchers access to potentially sensitive information regarding service internals with potential cross-tenant impact.
Cybersecurity Snapshot: First Quantum-resistant Algorithms Ready for Use, While New AI Risks’ Database Is Unveiled
August 16, 2024NIST has released the first encryption algorithms that can protect data against quantum attacks. Plus, MIT launched a new database of AI risks. Meanwhile, the CSA published a paper outlining the unique risks involved in building systems that use LLMs. And get the latest on Q2’s most prevalent malware, the Radar/Dispossessor ransomware gang and CVE severity assessments!
CVE-2024-7593: Ivanti Virtual Traffic Manager Authentication Bypass Vulnerability
August 14, 2024Ivanti released a patch for a critical severity authentication bypass vulnerability and a warning that exploit code is publicly available
- Threat Intelligence
- Threat Management
- Vulnerability Management
- Vulnerability Scanning