CVE-2022-30123 — A sequence injection vulnerability exists in Rack <2

A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possible shell escape in the Lint and CommonLogger components of Rack.

01What is this vulnerability?

A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possible shell escape in the Lint and CommonLogger components of Rack.

02Affected products

Vendor	Product	Versions
n	a / https://github.com/rack/rack	2.0.9.1, 2.1.4.1, 2.2.3.1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-12-05T00:00:00.000Z
• Last modified: 2024-08-03T06:40:47.582Z

09References

• discuss.rubyonrails.org — https://discuss.rubyonrails.org/t/cve-2022-30123-possible-shell-escape-sequence-…
• www.debian.org — https://www.debian.org/security/2023/dsa-5530
• security.gentoo.org — https://security.gentoo.org/glsa/202310-18
• security.netapp.com — https://security.netapp.com/advisory/ntap-20231208-0011/