JLLeitschuh opened a new pull request, #157:
URL: https://github.com/apache/jclouds/pull/157
# Security Vulnerability Fix
This pull request fixes a Temporary File Information Disclosure
Vulnerability, which existed in this project.
## Preamble
The system temporary directory is shared between all users on most unix-like
systems (not MacOS, or Windows). Thus, code interacting with the system
temporary directory must be careful about file interactions in this directory,
and must ensure that the correct file posix permissions are set.
This PR was generated because a call to `File.createTempFile(..)` was
detected in this repository in a way that makes this project vulnerable to
local information disclosure.
With the default uname configuration, `File.createTempFile(..)` creates a
file with the permissions `-rw-r--r--`. This means that any other user on the
system can read the contents of this file.
### Impact
Information in this file is visible to other local users, allowing a
malicious actor co-resident on the same machine to view potentially sensitive
files.
#### Other Examples
- [CVE-2020-15250](https://github.com/advisories/GHSA-269g-pwp5-87pp) -
junit-team/junit
- [CVE-2021-21364](https://github.com/advisories/GHSA-hpv8-9rq5-hq7w) -
swagger-api/swagger-codegen
- [CVE-2022-24823](https://github.com/advisories/GHSA-5mcr-gq6c-3hq2) -
netty/netty
- [CVE-2022-24823](https://github.com/advisories/GHSA-269q-hmxg-m83q) -
netty/netty
# The Fix
The fix has been to convert the logic above to use the following API that
was introduced in Java 1.7.
```java
File tmpDir = Files.createTempFile("temp dir").toFile();
```
The API both creates the file securely, ie. with a random, non-conflicting
name, with file permissions that only allow the currently executing user to
read or write the contents of this file.
By default, `Files.createTempFile("temp dir")` will create a file with the
permissions `-rw-------`, which only allows the user that created the file to
view/write the file contents.
# :arrow_right: Vulnerability Disclosure :arrow_left:
:wave: Vulnerability disclosure is a super important part of the
vulnerability handling process and should not be skipped! This may be
completely new to you, and that's okay, I'm here to assist!
First question, do we need to perform vulnerability disclosure? It depends!
1. Is the vulnerable code only in tests or example code? No disclosure
required!
2. Is the vulnerable code in code shipped to your end users? Vulnerability
disclosure is probably required!
## Vulnerability Disclosure How-To
You have a few options options to perform vulnerability disclosure. However,
I'd like to suggest the following 2 options:
1. Request a CVE number from GitHub by creating a repository-level [GitHub
Security
Advisory](https://docs.github.com/en/code-security/repository-security-advisories/creating-a-repository-security-advisory).
This has the advantage that, if you provide sufficient information, GitHub
will automatically generate Dependabot alerts for your downstream consumers,
resolving this vulnerability more quickly.
2. Reach out to the team at Snyk to assist with CVE issuance. They can be
reached at the [Snyk's Disclosure Email](mailto:rep...@snyk.io).
## Detecting this and Future Vulnerabilities
This vulnerability was automatically detected by GitHub's CodeQL using this
[CodeQL
Query](https://codeql.github.com/codeql-query-help/java/java-local-temp-file-or-directory-information-disclosure/).
You can automatically detect future vulnerabilities like this by enabling
the free (for open-source) [GitHub
Action](https://github.com/github/codeql-action).
I'm not an employee of GitHub, I'm simply an open-source security researcher.
## Source
This contribution was automatically generated with an
[OpenRewrite](https://github.com/openrewrite/rewrite) [refactoring
recipe](https://docs.openrewrite.org/), which was lovingly hand crafted to
bring this security fix to your repository.
The source code that generated this PR can be found here:
[SecureTempFileCreation](https://github.com/openrewrite/rewrite-java-security/blob/main/src/main/java/org/openrewrite/java/security/SecureTempFileCreation.java)
## Opting-Out
If you'd like to opt-out of future automated security vulnerability fixes
like this, please consider adding a file called
`.github/GH-ROBOTS.txt` to your repository with the line:
```
User-agent: JLLeitschuh/security-research
Disallow: *
```
This bot will respect the [ROBOTS.txt](https://moz.com/learn/seo/robotstxt)
format for future contributions.
Alternatively, if this project is no longer actively maintained, consider
[archiving](https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-archiving-repositories)
the repository.
## CLA Requirements
_This section is only relevant if your project requires contributors to sign
a Contributor License Agreement (CLA) for external contributions._
It is unlikely that I'll be able to directly sign CLAs. However, all
contributed commits are already automatically signed-off.
> The meaning of a signoff depends on the project, but it typically
certifies that committer has the rights to submit this work under the same
license and agrees to a Developer Certificate of Origin
> (see
[https://developercertificate.org/](https://developercertificate.org/) for more
information).
>
> \- [Git Commit Signoff documentation](https://developercertificate.org/)
If signing your organization's CLA is a strict-requirement for merging this
contribution, please feel free to close this PR.
## Sponsorship & Support
This contribution is sponsored by HUMAN Security Inc. and the new Dan
Kaminsky Fellowship, a fellowship created to celebrate Dan's memory and legacy
by funding open-source work that makes the world a better (and more secure)
place.
This PR was generated by [Moderne](https://www.moderne.io/), a free-for-open
source SaaS offering that uses format-preserving AST transformations to fix
bugs, standardize code style, apply best practices, migrate library versions,
and fix common security vulnerabilities at scale.
## Tracking
All PR's generated as part of this fix are tracked here:
https://github.com/JLLeitschuh/security-research/issues/18
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