CNCSoft: Stack-based Buffer Overflow
CVE-2022-1405 is a high-severity stack-based buffer overflow vulnerability in CNCSoft from Delta Electronics, 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 unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists version 1.01.32 as the first without the flaw, so updating CNCSoft to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 2.23% chance of exploitation within 30 days, higher than 83% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update CNCSoft to 1.01.32 or a later version.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Delta Electronics | CNCSoft | All up to, but not including, 1.01.32 | 1.01.32 |
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
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- 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:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | CNA (hq.dhs.gov) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
CNCSoft: All versions prior to 1.01.32 does not properly sanitize input while processing a specific project file, allowing a possible stack-based buffer overflow condition.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Stack-based Buffer Overflow
The product writes past the end of a buffer that was allocated on the stack.
How developers prevent this class of flaw
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.
- Use an abstraction library to abstract away risky APIs. Not a complete solution.
- Implement and perform bounds checking on input.
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
Patches and release notes
- cisa.gov/uscert/ics/advisories/icsa-22-132-01Third Party Advisory, US Government Resource
Other vulnerabilities in CNCSoft
- 7.3 High severity
- 7.3 High severity
- 7.3 High severity
- 7.3 High severity
- 7.1 High severity
Recent Stack-based Buffer Overflow vulnerabilities
- 7.8 High severity
- 8.1 High severity
- 7.8 High severity
- 7.5 High severity
- 10.0 High severity
- 7.2 High severity
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