QID 352808

Date Published: 2021-09-13

QID 352808: Amazon Linux Security Advisory for golang: ALAS-2021-1527

A flaw was found in go, acting as an unintended proxy or intermediary, where reverseproxy forwards connection headers if the first one was empty.
This flaw allows an attacker to drop arbitrary headers.
The highest threat from this vulnerability is to integrity. (
( CVE-2021-33197) a flaw was found in go, where it attempts to allocate excessive memory.
This issue may cause panic or unrecoverable fatal error if passed inputs with very large exponents.
The highest threat from this vulnerability is to system availability. (
( CVE-2021-33198) a flaw was found in golang.
A panic can be triggered by an attacker in a privileged network position without access to the server certificate's private key, as long as a trusted ecdsa or ed25519 certificate for the server exists (or can be issued), or the client is configured with config.
Insecureskipverify.
Clients that disable all tls_rsa cipher suites (that is, tls 1.0-1.2 cipher suites without ecdhe), as well as tls 1.3-only clients, are unaffected. (
( CVE-2021-34558)




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.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 4.3 severity.
    • Solution
    Please refer to Amazon advisory: ALAS-2021-1527 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352808

    CVE-2021-33197 | CVE-2021-34558 | CVE-2021-33198 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS-2021-1527 Amazon Linux URL Logo alas.aws.amazon.com/ALAS-2021-1527.html
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