Proxy, Server: Incorrect Permission Assignment for Critical Resource
CVE-2022-23132 is a high-severity incorrect permission assignment for critical resource vulnerability in Proxy, Server from Zabbix, with a CVSS 3.1 base score of 7.3 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Proxy, Server versions: 4.0.0 - 4.0.36; 5.0.0 – 5.0.18; 5.4.0 – 5.4.8. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.86% chance of exploitation within 30 days, higher than 59% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Proxy, Server you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on support.zabbix.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Zabbix | Proxy, Server | 4.0.0 - 4.0.36; 5.0.0 – 5.0.18; 5.4.0 – 5.4.8 | Not stated |
| Zabbix | Zabbix | 4.0.0 through 4.0.36; 5.0.0 through 5.0.18; 5.4.0 through 5.4.8; 6.0.0 | Not stated |
| Fedora Project | Fedora | 34; 35 | 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
- NetworkCan be exploited remotely over a network, including the internet.
- 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
- LowSome restricted data can be read.
- Integrity
- LowLimited modification of data is possible.
- Availability
- LowPerformance or availability is reduced.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 3.3 | Low | CNA (zabbix.com) |
| CVSS 3.1 | 7.3 | High | NVD |
| CVSS 2.0 | 7.5 | High | NVD |
Official description
During Zabbix installation from RPM, DAC_OVERRIDE SELinux capability is in use to access PID files in [/var/run/zabbix] folder. In this case, Zabbix Proxy or Server processes can bypass file read, write and execute permissions check on the file system level
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Incorrect Permission Assignment for Critical Resource
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.
How developers prevent this class of flaw
- When using a critical resource such as a configuration file, check to see if the resource has insecure permissions (such as being modifiable by any regular user), and generate an error or even exit the software if there is a possibility that the resource could have been modified by an unauthorized party.
- Divide the software into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully defining distinct user groups, privileges, and/or roles. Map these against data, functionality, and the related resources. Then set the permissions accordingly. This will allow you to maintain more fine-grained control over your resources.
- During program startup, explicitly set the default permissions or umask to the most restrictive setting possible. Also set the appropriate permissions during program installation. This will prevent you from inheriting insecure permissions from any user who installs or runs the program.
More Incorrect Permission Assignment for Critical Resource vulnerabilities (CWE-732)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
- support.zabbix.com/browse/ZBX-20341Issue Tracking
Other references
Recent Incorrect Permission Assignment for Critical Resource vulnerabilities
- 9.1 Critical severity
- 7.8 High severity
- 7.8 High severity
- 4.3 Medium severity
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