QID 352371

Date Published: 2021-05-27

QID 352371: Amazon Linux Security Advisory for python3: ALAS2-2021-1640

<DIV ID="issue_overview"> the package python/cpython is vulnerable to web cache poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking.
When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server.
This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter. (
cve-2021-23336 ) no description is available for this cve. (
cve-2021-3426 ) </DIV>

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 Medium - 5.9 severity.
  • CVSS V2 rated as Medium - 4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2021-1640 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352371

    CVE-2021-3426 | CVE-2021-23336 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2021-1640 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2021-1640.html
    By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].