# ALBA-2021:0540: fence-agents bug fix and enhancement update

> This update adds IMDSv2 support to AWS fencing agents, improving security posture for cluster power management without addressing a specific vulnerability.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not stated
- **Attackable:** Not stated
- **Victim action needed:** Not stated
- **Fix available:** Yes
- **Published:** 16 Feb 2021

## What is ALBA-2021:0540?

ALBA-2021:0540 is a vulnerability in fence-agents-aliyun, published on 16 Feb 2021. 

### Official description

The fence-agents packages provide a collection of scripts for handling
remote power management for cluster devices. They allow failed or
unreachable nodes to be forcibly restarted and removed from the cluster.

Bug Fix(es) and Enhancement(s):

* fence_aws: add support for IMDSv2 (BZ#1905595)

## Which versions are affected by ALBA-2021:0540?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `fence-agents-aliyun` | AlmaLinux:8 | All versions | 4.2.1-53.el8_3.2 |
| `fence-agents-aws` | AlmaLinux:8 | All versions | 4.2.1-53.el8_3.2 |
| `fence-agents-azure-arm` | AlmaLinux:8 | All versions | 4.2.1-53.el8_3.2 |
| `fence-agents-gce` | AlmaLinux:8 | All versions | 4.2.1-53.el8_3.2 |

## How do I fix ALBA-2021:0540?

Upgrade to a fixed version.

## Is ALBA-2021:0540 being exploited?

There is no known exploitation of ALBA-2021:0540 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for ALBA-2021:0540 and fix it if it is affected.

What it is: ALBA-2021:0540 is a vulnerability in fence-agents-aliyun, published on 16 Feb 2021. 
Exploitation: There is no known exploitation of ALBA-2021:0540 in the wild and no public exploit code.

Affected product: fence-agents-aliyun. No package-level version data is available, so check the vendor advisory linked from the reference page.

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/ALBA-2021-0540/ (Markdown: https://insights.sbomify.com/ALBA-2021-0540/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/ALBA-2021:0540

---
From sbomify Insights: https://insights.sbomify.com/ALBA-2021-0540/
Summaries are generated and may contain mistakes; the official description above is the record.