CVE-2019-1579：Palo Alto Networks GlobalProtect SSL VPN 的重大預先驗證弱點公布
Researchers disclose a critical vulnerability in Palo Alto GlobalProtect SSL VPN solution used by many organizations.
背景說明
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.
分析
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.
概念驗證
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.
解決方法
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.”
找出受影響的系統
A list of Nessus plugins to identify this vulnerability will appear here as they’re released.
取得更多資訊
- Disclosure Blog from Orange Tsai and Meh Chang
- Palo Alto Security Advisory: PAN-SA-2019-0020
- Mitre: CVE-2019-1579
加入 Tenable Community 的 Tenable 安全回應團隊。
深入瞭解 Tenable，這是用於全面管理新型攻擊破綻的首創 Cyber Exposure 平台。
Get a free 60-day trial of Tenable.io.
相關文章
Cybersecurity Snapshot: Find MITRE ATT&CK Complex? Need Help Mapping to It? There’s an App for That!
March 10, 2023Learn about a new tool that streamlines MITRE ATT&CK mapping. Plus, known vulnerabilities remain a major cyber risk – just ask LastPass. Also, discover why SaaS data protection remains difficult. Plus, a look at the U.S. National Cybersecurity Strategy. And much more!
The Ransomware Ecosystem: In Pursuit of Fame and Fortune
July 28, 2022The key players within the ransomware ecosystem, including affiliates and initial access brokers, work together cohesively like a band of musicians, playing their respective parts as they strive for fame and fortune.
Brazen, Unsophisticated and Illogical: Understanding the LAPSUS$ Extortion Group
July 20, 2022Having gained the industry’s attention in the first months of 2022, the LAPSUS$ extortion group has largely gone quiet. What can we learn from this extortion group’s story and tactics?
Cybersecurity Snapshot: Latest MITRE ATT&CK Update Offers Security Insights on GenAI, Identity, Cloud and CI/CD
April 26, 2024Check out what’s new in Version 15 of the MITRE ATT&CK knowledge base of adversary tactics, techniques and procedures. Plus, learn the latest details about the Change Healthcare breach, including the massive scope of the data exfiltration. In addition, why AI cyberthreats aren’t impacting CISOs’ budgets. And much more!
CVE-2024-20353, CVE-2024-20359: Frequently Asked Questions About ArcaneDoor
April 25, 2024Frequently asked questions about CVE-2024-20353 and CVE-2024-20359, two vulnerabilities associated with “ArcaneDoor,” the espionage-related campaign targeting Cisco Adaptive Security Appliances.
CVE-2024-4040: CrushFTP Virtual File System (VFS) Sandbox Escape Vulnerability Exploited
April 23, 2024A zero-day vulnerability in CrushFTP was exploited in the wild against multiple U.S. entities prior to fixed versions becoming available as the vendor recommends customers upgrade as soon as possible.
- Threat Intelligence
- Threat Management
- Vulnerability Management
- Vulnerability Scanning