Medium: python3

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)

Affected Packages:

python3

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update python3 to update your system.

New Packages:

aarch64:  
    python3-3.7.9-1.amzn2.0.3.aarch64  
    python3-libs-3.7.9-1.amzn2.0.3.aarch64  
    python3-devel-3.7.9-1.amzn2.0.3.aarch64  
    python3-tools-3.7.9-1.amzn2.0.3.aarch64  
    python3-tkinter-3.7.9-1.amzn2.0.3.aarch64  
    python3-test-3.7.9-1.amzn2.0.3.aarch64  
    python3-debug-3.7.9-1.amzn2.0.3.aarch64  
    python3-debuginfo-3.7.9-1.amzn2.0.3.aarch64  
  
i686:  
    python3-3.7.9-1.amzn2.0.3.i686  
    python3-libs-3.7.9-1.amzn2.0.3.i686  
    python3-devel-3.7.9-1.amzn2.0.3.i686  
    python3-tools-3.7.9-1.amzn2.0.3.i686  
    python3-tkinter-3.7.9-1.amzn2.0.3.i686  
    python3-test-3.7.9-1.amzn2.0.3.i686  
    python3-debug-3.7.9-1.amzn2.0.3.i686  
    python3-debuginfo-3.7.9-1.amzn2.0.3.i686  
  
src:  
    python3-3.7.9-1.amzn2.0.3.src  
  
x86_64:  
    python3-3.7.9-1.amzn2.0.3.x86_64  
    python3-libs-3.7.9-1.amzn2.0.3.x86_64  
    python3-devel-3.7.9-1.amzn2.0.3.x86_64  
    python3-tools-3.7.9-1.amzn2.0.3.x86_64  
    python3-tkinter-3.7.9-1.amzn2.0.3.x86_64  
    python3-test-3.7.9-1.amzn2.0.3.x86_64  
    python3-debug-3.7.9-1.amzn2.0.3.x86_64  
    python3-debuginfo-3.7.9-1.amzn2.0.3.x86_64  

Additional References

Red Hat: CVE-2021-23336, CVE-2021-3426

Mitre: CVE-2021-23336, CVE-2021-3426