Debian: DLA-2808-1 Critical: Python 3.5 Denial of Service Issues
debian lts
November 5, 2021
There were a couple of vulnerabilites found in src:python3.5, the Python interpreter v3.5, and are as follows: CVE-2021-3733
Topics Covered
Summary
CVE-2021-3733
The ReDoS-vulnerable regex has quadratic worst-case complexity
and it allows cause a denial of service when identifying
crafted invalid RFCs. This ReDoS issue is on the client side
and needs remote attackers to control the HTTP server.
CVE-2021-3737
HTTP client can get stuck infinitely reading len(line) < 64k
lines after receiving a '100 Continue' HTTP response. This
could lead to the client being a bandwidth sink for anyone
in control of a server.
For Debian 9 stretch, these problems have been fixed in version
3.5.3-1+deb9u5.
We recommend that you upgrade your python3.5 packages.
For the detailed security status of python3.5 please refer to
its security tracker page at:
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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Package: python3.5
Version: 3.5.3-1+deb9u5
CVE ID: CVE-2021-3733 CVE-2021-3737
Topics Covered
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