QID 355276

Date Published: 2023-05-29

QID 355276: Amazon Linux Security Advisory for httpd : ALAS2023-2023-136

Some mod_proxy configurations on apache http server versions 2.4.0 through 2.4.55 allow a http request smuggling attack.
Configurations are affected when mod_proxy is enabled along with some form of rewriterule or proxypassmatch in which a non-specific pattern matches some portion of the user-supplied request-target (url) data and is then re-inserted into the proxied request-target using variable substitution.
For example, something like: rewriteengine on rewriterule "^/here/(.*)" "
Http://example.com:8080/elsewhere?$1"; [p] proxypassreverse /here/ http://example.com:8080/ request splitting/smuggling could result in bypass of access controls in the proxy server, proxying unintended urls to existing origin servers, and cache poisoning.
Users are recommended to update to at least version 2.4.56 of apache http server. (
( CVE-2023-25690) http response smuggling vulnerability in apache http server via mod_proxy_uwsgi.
This issue affects apache http server: from 2.4.30 through 2.4.55.
Special characters in the origin response header can truncate/split the response forwarded to the client. (
( CVE-2023-27522)



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 Critical - 9.8 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2023-2023-136 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 355276

    CVE-2023-25690 | CVE-2023-27522 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2023-2023-136 amazon linux 2023 URL Logo alas.aws.amazon.com/AL2023/ALAS-2023-136.html
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