Zabbix: Reliance on Cookies without Validation and Integrity Checking
CVE-2023-32725 is a high-severity reliance on cookies without validation and integrity checking vulnerability in Zabbix, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected Zabbix versions: 6.0.0 through 6.0.21; 6.4.0 through 6.4.6; 7.0.0alpha1 through 7.0.0alpha3. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.85% 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 Zabbix 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.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Zabbix | Zabbix | 6.0.0 through 6.0.21; 6.4.0 through 6.4.6; 7.0.0alpha1 through 7.0.0alpha3 | Not stated |
| Zabbix | Zabbix Server | 6.0.0 through 6.0.21; 6.4.0 through 6.4.6; 7.0.0 | Not stated |
| Zabbix | Frontend | 6.0.0 through 6.0.21; 6.4.0 through 6.4.6; 7.0.0 | 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
- RequiredA user must take an action such as opening a file or link.
- 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
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.6 | Critical | CNA (zabbix.com) |
| CVSS 3.1 | 8.8 | High | NVD |
Official description
The website configured in the URL widget will receive a session cookie when testing or executing scheduled reports. The received session cookie can then be used to access the frontend as the particular user.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Reliance on Cookies without Validation and Integrity Checking
The product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user.
How developers prevent this class of flaw
- Avoid using cookie data for a security-related decision.
- Perform thorough input validation (i.e.: server side validation) on the cookie data if you're going to use it for a security related decision.
- Add integrity checks to detect tampering.
More Reliance on Cookies without Validation and Integrity Checking vulnerabilities (CWE-565)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in Zabbix
- 7.8 High severity
- 9.1 Critical severity
- 7.5 High severity
- 8.8 High severity
- 8.8 High severity
- 8.1 High severity
Recent Reliance on Cookies without Validation and Integrity Checking vulnerabilities
- 9.8 Critical severity
- 7.2 High severity
- 9.8 Critical severity
- 7.5 High severity
- 8.8 High severity
- 8.1 High severity
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