CVE-2020-9452
This means that an unprivileged user can write/overwrite arbitrary files in arbitrary folders.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.48%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.48% probability · 40th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-59
- Affected
- acronis/true image 2020
- Source
- cve@mitre.org
References
- https://danishcyberdefence.dk/blogThird Party Advisory
- https://madsjoensen.dk/cve-2020-9452/Exploit, Third Party Advisory
- https://www.acronis.comVendor Advisory
- https://danishcyberdefence.dk/blogThird Party Advisory
- https://madsjoensen.dk/cve-2020-9452/Exploit, Third Party Advisory
- https://www.acronis.comVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.