UP T2 4K, ZXV10 B866V2-H, ZXV10 B866V2, ZXV10…: Incorrect Default Permissions
CVE-2023-25645 is a high-severity incorrect default permissions vulnerability in UP T2 4K, ZXV10 B866V2-H, ZXV10 B866V2, ZXV10 B860H V5D0, ZXV10 B866V2F, with a CVSS 3.1 base score of 7.7 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.27% 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
- Check which version of UP T2 4K, ZXV10 B866V2-H, ZXV10 B866V2, ZXV10 B860H V5D0, ZXV10 B866V2F you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on support.zte.com.cn for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| UP T2 4K, ZXV10 B866V2-H, ZXV10 B866V2, ZXV10 B860H V5D0, ZXV10 B866V2F | UP T2 4K, ZXV10 B866V2-H, ZXV10 B866V2, ZXV10 B860H V5D0, ZXV10 B866V2F | Not specified in the record | Not stated |
| ZTE | Up T2 4k Firmware | v84511302.1427 | Not stated |
| ZTE | Zxv10 B866v2-h Firmware | v84711321.0038; v84711321.0040; v84711321.0045; v84711321.0049 | Not stated |
| ZTE | Zxv10 B866v2 Firmware | v82811306.3021; v82815416.1027; v82815416.1028; v82815416.1029; v82815416.2012; v84711309.0016; v84711309.0018; v84711309.0019 | Not stated |
| ZTE | Zxv10 B860h V5d0 Firmware | v83011303.0049; v83011303.0051; v83011303.0053; v83011303.0063; v83011303.0069 | Not stated |
| ZTE | Zxv10 B866v2f Firmware | v86111338.0026; v86111338.0031; v86111338.0033; v86111338.0035 | Not stated |
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
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.7 | High | NVD |
| CVSS 3.1 | 7.7 | High | CISA (ADP) |
Official description
There is a permission and access control vulnerability in some ZTE AndroidTV STBs. Due to improper permission settings, non-privileged application can perform functions that are protected with signature/privilege-level permissions. Exploitation of this vulnerability could clear personal data and applications on the user's device, affecting device operation.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Incorrect Default Permissions
During installation, installed file permissions are set to allow anyone to modify those files.
How developers prevent this class of flaw
- The architecture needs to access and modification attributes for files to only those users who actually require those actions.
- Compartmentalize the system to have safe areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
More Incorrect Default Permissions vulnerabilities (CWE-276)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Recent Incorrect Default Permissions vulnerabilities
- 7.8 High severity
- 7.8 High severity
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- 7.8 High severity
- 9.8 Critical severity
- 9.8 Critical severity
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