Path traversal and remote code execution in Citrix ADC and Gateway



Published: 2020-01-14
Severity Critical
Patch available NO
Number of vulnerabilities 1
CVE ID CVE-2019-19781
CWE ID CWE-22
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Citrix NetScaler Application Delivery Controller
Server applications / Application servers

Vendor Citrix

Security Advisory

This security advisory describes one critical risk vulnerability.

1) Path traversal

Severity: Critical

CVSSv3: 9.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:U/RC:C] [PCI]

CVE-ID: CVE-2019-19781

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in Citrix NetScaler. A remote attacker can send a specially crafted HTTP request and read arbitrary files or execute commands on the system.

Successful exploitation of the vulnerability may allow remote code execution.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Citrix NetScaler Application Delivery Controller: 10.5, 10.5e, 11.0, 11.1, 12.0, 12.1, 13.0

CPE External links

http://packetstormsecurity.com/files/155904/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution.html
http://packetstormsecurity.com/files/155905/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution-Traversal.html
http://packetstormsecurity.com/files/155930/Citrix-Application-Delivery-Controller-Gateway-10.5-Remote-Code-Execution.html
https://badpackets.net/over-25000-citrix-netscaler-endpoints-vulnerable-to-cve-2019-19781/
https://forms.gle/eDf3DXZAv96oosfj6
https://support.citrix.com/article/CTX267027
https://twitter.com/bad_packets/status/1215431625766424576
https://www.kb.cert.org/vuls/id/619785
https://www.ptsecurity.com/ww-en/about/news/citrix-vulnerability-allows-criminals-to-hack-networks-of-80000-companies/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.