BIG-IP: Incorrect Calculation
CVE-2022-23011 is a high-severity incorrect calculation vulnerability in BIG-IP, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected BIG-IP versions: 15.1.x before 15.1.4 and 14.1.x before 14.1.3. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.93% chance of exploitation within 30 days, higher than 61% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Big-ip Access Policy Manager to 14.1.3 or 15.1.4, whichever matches your release line, or a later version.
- Update Big-ip Advanced Firewall Manager to 14.1.3 or 15.1.4, whichever matches your release line, or a later version.
- Update Big-ip Analytics to 14.1.3 or 15.1.4, whichever matches your release line, or a later version.
- Read the advisory on support.f5.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 |
|---|---|---|---|
| BIG-IP | BIG-IP | 15.1.x before 15.1.4 and 14.1.x before 14.1.3 | Not stated |
| F5 | Big-ip Access Policy Manager | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Advanced Firewall Manager | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Analytics | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Application Acceleration Manager | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Application Security Manager | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Domain Name System | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Fraud Protection Service | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Global Traffic Manager | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Link Controller | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Local Traffic Manager | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
| F5 | Big-ip Policy Enforcement Manager | 14.1.0 up to, but not including, 14.1.3; 15.1.0 up to, but not including, 15.1.4 | 14.1.3, 15.1.4 |
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
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 2.0 | 5.0 | Medium | NVD |
Official description
On certain hardware BIG-IP platforms, in version 15.1.x before 15.1.4 and 14.1.x before 14.1.3, virtual servers may stop responding while processing TCP traffic due to an issue in the SYN Cookie Protection feature. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Incorrect Calculation
The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.
How developers prevent this class of flaw
- Understand your programming language's underlying representation and how it interacts with numeric calculation. Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, not-a-number calculations, and how your language handles numbers that are too large or too small for its underlying representation.
- Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
- Use the appropriate type for the desired action. For example, in C/C++, only use unsigned types for values that could never be negative, such as height, width, or other numbers related to quantity.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
- support.f5.com/csp/article/K68755210Mitigation
Other vulnerabilities in BIG-IP
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- 7.5 High severity
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