security-advisories: Improper Preservation of Permissions
CVE-2024-37882 is a high-severity improper preservation of permissions vulnerability in security-advisories from Nextcloud, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected security-advisories versions: >= 26.0.0, < 26.0.13; >= 27.0.0, < 27.1.8; >= 28.0.0, < 28.0.4. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.54% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Nextcloud Server to 26.0.13 or 27.1.8 or 28.0.4 or 23.0.12.17, whichever matches your release line, or a later version.
- Read the advisory on github.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Nextcloud | security-advisories | >= 26.0.0, < 26.0.13; >= 27.0.0, < 27.1.8; >= 28.0.0, < 28.0.4 | Not stated |
| Nextcloud | Nextcloud Server | 26.0.0 up to, but not including, 26.0.13; 27.0.0 up to, but not including, 27.1.8; 28.0.0 up to, but not including, 28.0.4; 23.0.0 up to, but not including, 23.0.12.17; 24.0.0 up to, but not including, 24.0.12.13; 25.0.0 up to, but not including, 25.0.13.8 | 26.0.13, 27.1.8, 28.0.4, 23.0.12.17, 24.0.12.13, 25.0.13.8 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.1 | High | CNA (github.com) |
| CVSS 3.1 | 8.1 | High | NVD |
Official description
Nextcloud Server is a self hosted personal cloud system. A recipient of a share with read&share permissions could reshare the item with more permissions. It is recommended that the Nextcloud Server is upgraded to 26.0.13 or 27.1.8 or 28.0.4 and that the Nextcloud Enterprise Server is upgraded to 26.0.13 or 27.1.8 or 28.0.4.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Preservation of Permissions
The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.
More Improper Preservation of Permissions vulnerabilities (CWE-281)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Other references
- hackerone.com/reports/2289425Issue Tracking
Other vulnerabilities in security-advisories
- 7.1 High severity
- 8.2 High severity
- 8.8 High severity
- 8.1 High severity
- 8.1 High severity
Recent Improper Preservation of Permissions vulnerabilities
- 7.8 High severity
- 7.8 High severity
- 8.1 High severity
- 7.5 High severity
- 7.8 High severity
- 8.8 High severity
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