SYSTEM privilege escalation via hardlink overwrite
Published May 25, 2021 · Updated Aug 4, 2024
Privilege escalation in Acronis True Image 2020 24.5.22510 allows local users to gain SYSTEM privileges via crafted quarantine file moves. The anti_ransomware_service.exe quarantine routine copies attacker-influenced files with SYSTEM rights, and a hardlink in the writable quarantine directory redirects that copy to overwrite arbitrary paths. The quarantine feature is disabled by default, but a local user can trigger it through the service REST API; successful exploitation provides arbitrary file write and SYSTEM-level execution potential.
Summary
What happened
Privilege escalation in Acronis True Image 2020 24.5.22510 allows local users to gain SYSTEM privileges via crafted quarantine file moves. The anti_ransomware_service.exe quarantine routine copies attacker-influenced files with SYSTEM rights, and a hardlink in the writable quarantine directory redirects that copy to overwrite arbitrary paths. The quarantine feature is disabled by default, but a local user can trigger it through the service REST API; successful exploitation provides arbitrary file write and SYSTEM-level execution potential.
The record
- CVE
- CVE-2020-9452
- Published
- May 25, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-59, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 25, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- CVE-2020-9452: Local privilege escalation in Acronis True Image 2020proof of concept · demonstrated
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Technologies
Your stack
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Your stack
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