initial draft of the security audit blog post (#1924)

* initial draft
* address review feedback and polish
* add generated files
* update to today
* updates

Signed-off-by: William Morgan <william@buoyant.io>

Author: wmorgan

linkerd.io/content/blog/2025/0218-security-audit/cover.jpg

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+---
+date: 2025-02-18T00:00:00Z
+title: |-
+  Linkerd 2024 Security Audit
+description: |-
+  We're happy to announce the results of Linkerd's 2024 security audit,
+  courtesy of 7ASecurity, the Open Source Technology Improvement Fund (OSTIF),
+  and the Cloud Native Computing Foundation (CNCF).
+keywords: [linkerd, security]
+params:
+  author: william
+  showCover: true
+---
+
+Today we're happy to report that Linkerd has successfully completed its 2024
+security audit. This audit, initiated at the tail end of last year and concluded
+early this year, was performed by [7ASecurity](https://7asecurity.com/), managed
+by the [Open Source Technology Improvement Fund](https://ostif.org/), and funded
+by the [Cloud Native Computing Foundation](https://cncf.io/). As part of
+Linkerd's commitment to openness, transparency, and security by design, we've
+published the unredacted report in the [Linkerd GitHub
+page](https://github.com/linkerd/linkerd2/tree/main/audits).
+
+This was the third such public audit that Linkerd has undergone, and included
+both pen testing and whitebox testing. We were happy to collaborate with the
+7ASecurity team and OSTIF in the performance of this audit, and particularly
+happy with this excerpt from the report:
+
+> The Linkerd team was incredibly responsive and helpful during the engagement
+> and quick to resolve the reported issues, with multiple fixes already
+> deployed. The audit report makes note of the fact that the Linkerd project
+> reflects hard work and dedication to security, both in the code and in their
+> practices. The security recommendations for further work are very specific,
+> meaning that a lot of basic and even intermediate security steps have already
+> been satisfactorily undertaken by the team. This audit reflects well on the
+> Graduated status of this project through the CNCF Graduation Program.
+
+As we said in our [2022 audit blog
+post](/2022/06/27/announcing-the-completion-of-linkerds-2022-security-audit/),
+no software is perfect, even Linkerd, and every architectural decision
+necessarily involves tradeoffs. The point of a security audit is not to produce
+a report card but to find the weak points and provide opportunities to address
+them before they become user-facing vulnerabilities.
+
+As usual, the audit flagged an assortment of issues of varying severity, and we
+worked closely with the 7ASecurity team to either address them or classify them
+as low user risk. For example, the most severe finding identified an unused
+development-time script used to generate protobuf bindings, which in some cases
+would output instructions to the developer to download a resource from a
+plaintext HTTP URL. This script was not part of the modern development process
+and we [removed it from the
+repo](https://github.com/linkerd/linkerd2/pull/13459). You can read the complete
+[OSTIF blog post](https://ostif.org/linkerd-audit-complete/) for more.
+
+Regular third-party audits are just one part of Linkerd’s comprehensive focus on
+world-class security, which includes code review for all changes, a formal
+security policy, a vast series of automated checks (including static analysis,
+dependency analysis, and fuzz testing) and much more. Linkerd is trusted by
+users around the world not just to be secure but to increase the security of
+their systems. We hold that trust sacred, and strive our best to live up to it
+with every line of code.
+
+## Linkerd is for everyone
+
+Linkerd is a graduated project of the
+[Cloud Native Computing Foundation](https://cncf.io/). Linkerd is
+[committed to open governance.](/2019/10/03/linkerds-commitment-to-open-governance/)
+If you have feature requests, questions, or comments, we'd love to have you join
+our rapidly-growing community! Linkerd is hosted on
+[GitHub](https://github.com/linkerd/), and we have a thriving community on
+[Slack](https://slack.linkerd.io/), [Twitter](https://twitter.com/linkerd), and
+in [mailing lists](/community/get-involved/). Come and join the fun!
+
+(*Photo by [Caspar
+Rae](https://unsplash.com/@raecaspar?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash)
+on [Unsplash](https://unsplash.com/photos/man-in-yellow-jacket-standing-beside-white-car--MBPgdHD_SA?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash").*)