An issue was discovered in Acronis True Image 2020 24.5.22510. anti_ransomware_service.exe includes functionality to quarantine files by copying a suspected ransomware file from one directory to another using SYSTEM privileges. Because unprivileged users have write permissions in the quarantine folder, it is possible to control this privileged write with a hardlink. This means that an unprivileged user can write/overwrite arbitrary files in arbitrary folders. Escalating privileges to SYSTEM is trivial with arbitrary writes. While the quarantine feature is not enabled by default, it can be forced to copy the file to the quarantine by communicating with anti_ransomware_service.exe through its REST API.

An issue was discovered in Acronis True Image 2020 24.5.22510. anti_ransomware_service.exe exposes a REST API that can be used by everyone, even unprivileged users. This API is used to communicate from the GUI to anti_ransomware_service.exe. This can be exploited to add an arbitrary malicious executable to the whitelist, or even exclude an entire drive from being monitored by anti_ransomware_service.exe.

Acronis True Image for Windows prior to 2021 Update 3 allowed local privilege escalation due to a DLL hijacking vulnerability in multiple components, aka an Untrusted Search Path issue.

Acronis True Image 2021 includes an OpenSSL component that specifies an OPENSSLDIR variable as a subdirectory within C:\jenkins_agent\. Acronis True Image contains a privileged service that uses this OpenSSL component. Because unprivileged Windows users can create subdirectories off of the system root, a user can create the appropriate path to a specially-crafted openssl.cnf file to achieve arbitrary code execution with SYSTEM privileges.

Acronis True Image 2021 fails to properly set ACLs of the C:\ProgramData\Acronis directory. Because some privileged processes are executed from the C:\ProgramData\Acronis, an unprivileged user can achieve arbitrary code execution with SYSTEM privileges by placing a DLL in one of several paths within C:\ProgramData\Acronis.

Acronis True Image up to and including version 2017 Build 8053 performs software updates using HTTP. Downloaded updates are only verified using a server-provided MD5 hash.

Acronis True Image Echo Server 9.x build 8072 on Linux does not properly encrypt backups to an FTP server, which allows remote attackers to obtain sensitive information. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

Acronis True Image Group Server 1.5.19.191 and earlier, included in Acronis True Image Enterprise Server 9.5.0.8072 and the other True Image packages, allows remote attackers to cause a denial of service (crash) via a packet with an invalid length field, which causes an out-of-bounds read.

Acronis True Image Windows Agent 1.0.0.54 and earlier, included in Acronis True Image Enterprise Server 9.5.0.8072 and the other True Image packages, allows remote attackers to cause a denial of service (crash) via a malformed packet to port 9876, which triggers a NULL pointer dereference.