BIG-IP Edge Client: Improper Verification of Cryptographic Signature
CVE-2023-38418 is a high-severity improper verification of cryptographic signature vulnerability in BIG-IP Edge Client from F5, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists version 7.2.4.3 as the first without the flaw, so updating BIG-IP Edge Client to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.14% 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 BIG-IP Edge Client to 7.2.4.3 or a later version.
- Update Access Policy Manager Clients to 7.2.4.3 or a later version.
- Read the advisory on my.f5.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| F5 | BIG-IP Edge Client | 7.2.3 up to, but not including, 7.2.4.3 | 7.2.4.3 |
| F5 | Access Policy Manager Clients | 7.2.3 up to, but not including, 7.2.4.3 | 7.2.4.3 |
| F5 | Big-ip Access Policy Manager | 13.1.0 through 13.1.5; 14.1.0 through 14.1.5; 15.1.0 through 15.1.9; 16.1.0 through 16.1.3; 17.0.0 through 17.1.0 | 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
- 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
- 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
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | CNA (f5.com) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
The BIG-IP Edge Client Installer on macOS does not follow best practices for elevating privileges during the installation process. 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: Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)
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
Advisories
Other vulnerabilities in BIG-IP Edge Client
- 7.3 High severity
- 7.4 High severity
- 7.8 High severity
- 7.8 High severity
- 8.2 High severity
- 7.1 High severity
Recent Improper Verification of Cryptographic Signature vulnerabilities
- 7.8 High severity
- 7.8 High severity
- 7.7 High severity
- 8.8 High severity
- 9.1 Critical severity
- 7.8 High severity
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