Versa Director Dangerous File Type Upload
CVE-2024-39717 is a high-severity unrestricted upload of file with dangerous type vulnerability in Director from Versa, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. The record lists version 21.2.3 before 2024-06-21 as the first without the flaw, so updating Director to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on August 23, 2024, which means attacks have been observed in the wild.
Attackers are already exploiting this vulnerability, according to CISA.
What to do
- Update Director to 21.2.3 before 2024-06-21 or a later version.
- Update versa_director to 21.2.3_2024-06-21 or 22.1.2_2024-06-21 or 22.1.3_2024-06-21, whichever matches your release line, or a later version.
- CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Read the advisory on versa-networks.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Versa | Director | 21.2.2 and earlier; 21.2.3 before 2024-06-21 up to, but not including, 21.2.3 before 2024-06-21; 22.1.1 and earlier; 22.1.2 before 2024-06-21 and earlier; 22.1.3 before 2024-06-21 and earlier | 21.2.3 before 2024-06-21 |
| Versa-networks | versa_director | 21.2.2; 21.2.3 up to, but not including, 21.2.3_2024-06-21; 22.1.1; 22.1.2 up to, but not including, 22.1.2_2024-06-21; 22.1.3 up to, but not including, 22.1.3_2024-06-21 | 21.2.3_2024-06-21, 22.1.2_2024-06-21, 22.1.3_2024-06-21 |
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
- HighAdministrator-level access is required first.
- 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:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.2 | High | NVD |
| CVSS 3.0 | 6.6 | Medium | CNA (hackerone.com) |
Official description
The Versa Director GUI provides an option to customize the look and feel of the user interface. This option is only available for a user logged with Provider-Data-Center-Admin or Provider-Data-Center-System-Admin. (Tenant level users do not have this privilege). The “Change Favicon” (Favorite Icon) option can be mis-used to upload a malicious file ending with .png extension to masquerade as image file. This is possible only after a user with Provider-Data-Center-Admin or Provider-Data-Center-System-Admin has successfully authenticated and logged in.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
How developers prevent this class of flaw
- Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
More Unrestricted Upload of File with Dangerous Type vulnerabilities (CWE-434)
Timeline
- CVE record published.
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: total).
- Deadline for US federal agencies to remediate, set by CISA.
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-39717US Government Resource
Other vulnerabilities in Director
- 9.8 Critical severity
- 7.5 High severity
- 7.2 High severity
- 7.2 High severity
- 8.8 High severity
- 9.8 Critical severity
Recent Unrestricted Upload of File with Dangerous Type vulnerabilities
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 9.8 Critical severity
- 7.2 High severity
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