QID 356374

Date Published: 2023-10-18

QID 356374: Amazon Linux Security Advisory for amazon-ssm-agent : ALAS2023-2023-373

The http/1 client does not fully validate the contents of the host header.
A maliciously crafted host header can inject additional headers or entire requests.
With fix, the http/1 client now refuses to send requests containing an invalid request.
Host or request.
Url.host value. (
( CVE-2023-29406) extremely large rsa keys in certificate chains can cause a client/server to expend significant cpu time verifying signatures.
With fix, the size of rsa keys transmitted during handshakes is restricted to <= 8192 bits.
Based on a survey of publicly trusted rsa keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed.
It is possible there are larger keys in use in private pkis, but we target the web pki, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable. (
( CVE-2023-29409) text nodes not in the html namespace are incorrectly literally rendered, causing text which should be escaped to not be.
This could lead to an xss attack. (
( CVE-2023-3978)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 6.5 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2023-2023-373 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 356374

    CVE-2023-3978 | CVE-2023-29406 | CVE-2023-29409 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2023-2023-373 amazon linux 2023 URL Logo alas.aws.amazon.com/AL2023/ALAS-2023-373.html
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