(1) pass through /courier/document_root.html.The Apache /var/opt/cache/rewrite.log file may also contain the following evidence of compromise:
The clean-up functionality of the webshell helps evade detection and analysis during post incident response. The webshell allows the attacker to send commands to targeted devices, exfiltrate data, and clean up logs. The webshell is located on the target system in the file /home/httpd/html/about.html or /home/seos/courier/about.html. Actors have exploited this vulnerability to deploy a webshell on compromised systems. One of the exploited vulnerabilities (CVE-2021-27101) is an SQL injection vulnerability that allows an unauthenticated user to run remote commands on targeted devices. CVE-2021-27104 – Operating system command execution via a crafted POST request (affects FTA 9_12_370 and earlier).CVE-2021-27103 – Server-side request forgery via a crafted POST request (affects FTA 9_12_411 and earlier).CVE-2021-27102 – Operating system command execution via a local web service call (affects FTA versions 9_12_411 and earlier).CVE-2021-27101 – Structured Query Language (SQL) injection via a crafted HOST header (affects FTA 9_12_370 and earlier).Since then, Accellion has identified cyber actors targeting FTA customers by leveraging the following additional vulnerabilities.
Accellion file transfer appliance Patch#
In mid-December 2020, Accellion was made aware of a zero-day vulnerability in Accellion FTA and released a patch on December 23, 2020. Technical DetailsĪccellion FTA is a file transfer application that is used to share files.
Accellion file transfer appliance pdf#
For a downloadable copy of IOCs, see: AA21-055B.stix and MAR-10325064-1.v1.stix.Ĭlick here for a PDF version of this report. This Joint Cybersecurity Advisory provides indicators of compromise (IOCs) and recommended mitigations for this malicious activity. In some instances observed, the attacker has subsequently extorted money from victim organizations to prevent public release of information exfiltrated from the Accellion appliance. In one incident, an attack on an SLTT organization potentially included the breach of confidential organizational data. According to Accellion, this activity involves attackers leveraging four vulnerabilities to target FTA customers. Worldwide, actors have exploited the vulnerabilities to attack multiple federal and state, local, tribal, and territorial (SLTT) government organizations as well as private industry organizations including those in the medical, legal, telecommunications, finance, and energy sectors. This activity has impacted organizations globally, including those in Australia, New Zealand, Singapore, the United Kingdom, and the United States. These authorities are aware of cyber actors exploiting vulnerabilities in Accellion File Transfer Appliance (FTA). This joint advisory is the result of a collaborative effort by the cybersecurity authorities of Australia, New Zealand, Singapore, the United Kingdom, and the United States.
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