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The eSentire Security Operations Center (SOC) has observed active exploitation of Citrix vulnerability CVE-2019-19781 to deliver cryptocurrency mining malware to vulnerable systems. At this time, eSentire has only seen CVE-2019-19781 exploited to install a cryptocurrency miner, but CVE-2019-19781 could be exploited for a wide variety of malicious purposes. Due to the ease of exploitation, lack of available security patches, and the observation of attacks against eSentire clients, the eSentire Threat Intelligence team recommends applying the mitigation actions provided by Citrix as soon as possible .
What we’re doing about it:
What you should do about it:
CVE-2019-19781 allows simple directory traversal by a remote attacker in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. No patches have been made available at this time.
At this time, all activity identified by eSentire security teams has been related to deploying cryptocurrency miners. Associated indicators of compromise can be found below.
Dec 16 - Vulnerability publicly disclosed by Citrix 
Dec 16 - Mitigation steps provided by Citrix 
Dec 23 - Positive Technologies comments on the potential impact of the vulnerability 
Dec 31 - SANS releases a speculative proof of concept 
Jan 8 - Active exploitation of honeypot environment observed by researcher Kevin Beaumont 
Jan 8 - Initial Citrix advisory was released by eSentire 
Jan 12 - Exploitation to deliver cryptocurrency mining malware was identified by eSentire
Expected Patch Release 
|Version||Expected Patch Release Date|
|13||Jan 27, 2020|
|12.1||Jan 27, 2020|
|12||Jan 20, 2020|
|11.1||Jan 20, 2020|
|10.5||Jan 31, 2020|
Indicators of Compromise (Cryptocurrency Malware Campaign)
|hxxp: //185.178[.]45.221/ci.sh||Hosting installation script for cryptocurrency miner|
|hxxp: //62.113[.]112.33/ci.sh||Hosting installation script for cryptocurrency miner|
|hxxp: //217.12[.]221.12/netscalerd||XMRig Cryptocurrency Miner|
|08f76eb3d62d53bff131d2cb0af2773d||MD5 Hash for XMRig|
|fecccb8a7274992fb76426457bb8a8cc76637d46||SHA-1 Hash for XMRig|
SHA-256 Hash for XMRig