# CVE-2021-23331: Insecure Temporary File

> Local attackers can read downloaded files due to insecure temporary file permissions in the Squareup Connect SDK.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:P/RL:W/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Feb 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-q4hm-fwc9-hmv6

## What is CVE-2021-23331?

CVE-2021-23331 is a medium-severity vulnerability in com.squareup:connect, published on 3 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

This affects all versions of package com.squareup:connect. The method prepareDownloadFilecreates creates a temporary file with the permissions bits of -rw-r--r-- on unix-like systems. On unix-like systems, the system temporary directory is shared between users. As such, the contents of the file downloaded by downloadFileFromResponse will be visible to all other users on the local system. A workaround fix for this issue is to set the system property java.io.tmpdir to a safe directory as remediation. Note: This version of the SDK is end of life and no longer maintained, please upgrade to the latest version.

## Which versions are affected by CVE-2021-23331?

2 open source packages ship an affected version, including com.squareup:connect. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `com.squareup:connect` | Maven | All versions to 2.20191120.0 | None |
| `com.squareup:connect` | Maven | All versions to 2.20191120.0 | None |

Products: Squareup Connect Java Software Development Kit.

## How do I fix CVE-2021-23331?

No fix has been published for CVE-2021-23331 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-23331 being exploited?

There is no known exploitation of CVE-2021-23331 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-23331 and fix it if it is affected.

What it is: CVE-2021-23331 is a medium-severity vulnerability in com.squareup:connect, published on 3 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-23331 in the wild and no public exploit code.

Affected packages and fixed versions:
- com.squareup:connect (Maven): affected all versions up to 2.20191120.0; no fix listed
- com.squareup:connect (Maven): affected all versions up to 2.20191120.0; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-23331/ (Markdown: https://insights.sbomify.com/CVE-2021-23331/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-23331
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-23331
- OSV: https://osv.dev/vulnerability/CVE-2021-23331

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-23331/
Summaries are generated and may contain mistakes; the official description above is the record.