Arbitrary Code Injection Affecting amazon-ssm-agent package, versions <0:3.2.1705.0-1.amzn2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.86% (83rd percentile)

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  • Snyk IDSNYK-AMZN2-AMAZONSSMAGENT-6016207
  • published20 Oct 2023
  • disclosed6 Apr 2023

Introduced: 6 Apr 2023

CVE-2023-24538  (opens in a new tab)
CWE-94  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 amazon-ssm-agent to version 0:3.2.1705.0-1.amzn2 or higher.
This issue was patched in ALAS2-2023-2303.

NVD Description

Note: Versions mentioned in the description apply only to the upstream amazon-ssm-agent package and not the amazon-ssm-agent package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

Templates do not properly consider backticks (`) as Javascript string delimiters, and do not escape them as expected. Backticks are used, since ES6, for JS template literals. If a template contains a Go template action within a Javascript template literal, the contents of the action can be used to terminate the literal, injecting arbitrary Javascript code into the Go template. As ES6 template literals are rather complex, and themselves can do string interpolation, the decision was made to simply disallow Go template actions from being used inside of them (e.g. "var a = {{.}}"), since there is no obviously safe way to allow this behavior. This takes the same approach as github.com/google/safehtml. With fix, Template.Parse returns an Error when it encounters templates like this, with an ErrorCode of value 12. This ErrorCode is currently unexported, but will be exported in the release of Go 1.21. Users who rely on the previous behavior can re-enable it using the GODEBUG flag jstmpllitinterp=1, with the caveat that backticks will now be escaped. This should be used with caution.

CVSS Scores

version 3.1