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6.5
CVE-2021-43043: An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The apache user could read arbitrary files such as /etc/shadow by abusing an insecure Sudo rule.
CVE-2021-43043 · published 4 years ago
Summary
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The apache user could read arbitrary files such as /etc/shadow by abusing an insecure Sudo rule.
What to do
- Update kaseya unitrends_backup to version 10.5.5 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| kaseya | unitrends_backup |
>= 10.0, < 10.5.5 cpe:2.3:a:kaseya:unitrends_backup:*:*:*:*:*:*:*:* |
Original advisory text
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The apache user could read arbitrary files such as /etc/shadow by abusing an insecure Sudo rule.
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The apache user could read arbitrary files such as /etc/shadow by abusing an insecure Sudo rule.
References
- https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961 Vendor Advisory
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-applian... Exploit Third Party Advisory
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-applian... Exploit Third Party Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker partial control (estimated)
Timeline
Published6 Dec 2021
Updated31 Oct 2026
First seen29 Sep 2026
Sources
CVE-2021-43043 · NVD
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