Amazon Linux 2 Security Advisory: ALAS-2021-1640
Advisory Release Date: 2021-05-20 16:15 Pacific
Advisory Updated Date: 2021-05-24 17:59 Pacific
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.
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