Windows Virtual Delivery Agent: Improper Privilege Management
CVE-2024-6151 is a high-severity improper privilege management vulnerability in Windows Virtual Delivery Agent from Citrix, 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 versions 0, CU9, CU5 as the first without the flaw, so updating Windows Virtual Delivery Agent to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.21% 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 Windows Virtual Delivery Agent to 0 or CU9 or CU5, whichever matches your release line, or a later version.
- Update virtual_apps_and_desktops to 2402 or CU9 or CU5, whichever matches your release line, or a later version.
- Read the advisory on support.citrix.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Citrix | Windows Virtual Delivery Agent | 2402 up to, but not including, 0; 1912 LTSR up to, but not including, CU9; 2203 LTSR up to, but not including, CU5 | 0, CU9, CU5 |
| Citrix | virtual_apps_and_desktops | before 2402; 1912 LTSR up to, but not including, CU9; 2203 LTSR up to, but not including, CU5 | 2402, CU9, CU5 |
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 4.0 | 8.5 | High | CNA (citrix.com) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
Local Privilege escalation allows a low-privileged user to gain SYSTEM privileges in Virtual Delivery Agent for Windows used by Citrix Virtual Apps and Desktops and Citrix DaaS
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Privilege Management
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
How developers prevent this class of flaw
- Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.
More Improper Privilege Management vulnerabilities (CWE-269)
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
Recent Improper Privilege Management vulnerabilities
- 8.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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