#VU24233 Path traversal in Citrix NetScaler Application Delivery Controller - CVE-2019-19781
Published: January 14, 2020 / Updated: June 17, 2021
Vulnerability identifier: #VU24233
Vulnerability risk: Critical
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red
CVE-ID: CVE-2019-19781
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
Citrix NetScaler Application Delivery Controller
Citrix NetScaler Application Delivery Controller
Software vendor:
Citrix
Citrix
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.
Remediation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
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/