Thunder ADC: Improper Limitation of a Pathname to a Restricted Directory
CVE-2023-42130 is a high-severity improper limitation of a pathname to a restricted directory vulnerability in Thunder ADC from A10, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected Thunder ADC versions: vThunder 5.2.1-p3, build 70. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 2.15% chance of exploitation within 30 days, higher than 82% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update thunder_adc to 5.2.1-p8 or a later version.
- Update Advanced Core Operating System to 5.2.1 or 6.0.2, whichever matches your release line, or a later version.
- Read the advisory on support.a10networks.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| A10 | Thunder ADC | vThunder 5.2.1-p3, build 70 | Not stated |
| A10networks | thunder_adc | 6.0.0 through 6.0.1; 5.2.1-p1 up to, but not including, 5.2.1-p8; 5.1.0 through 5.2.1; 4.1.4-gr1-p6 through 4.1.4-gr1-p12; 4.1.4 through 4.1.4-gr1-p5 | 5.2.1-p8 |
| A10networks | Advanced Core Operating System | 5.1.0 up to, but not including, 5.2.1; 6.0.0 up to, but not including, 6.0.2; 4.1.4; 5.2.1 | 5.2.1, 6.0.2 |
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
- 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:N/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 | 8.8 | High | NVD |
| CVSS 3.0 | 8.3 | High | CNA (trendmicro.com) |
Official description
A10 Thunder ADC FileMgmtExport Directory Traversal Arbitrary File Read and Deletion Vulnerability. This vulnerability allows remote attackers to read and delete arbitrary files on affected installations of A10 Thunder ADC. Authentication is required to exploit this vulnerability. The specific flaw exists within the FileMgmtExport class. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to read and delete files in the context of the service account. . Was ZDI-CAN-17905.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Limitation of a Pathname to a Restricted Directory
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
How developers prevent this class of flaw
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.
More Improper Limitation of a Pathname to a Restricted Directory vulnerabilities (CWE-22)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Third-party and government advisories
- zerodayinitiative.com/advisories/ZDI-23-1496/Third Party Advisory
Other vulnerabilities in Thunder ADC
- 7.8 High severity
- 8.8 High severity
Recent Improper Limitation of a Pathname to a Restricted Directory vulnerabilities
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 7.8 High severity
- 7.2 High severity
- 8.8 High severity
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