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Ubuntu Security Notice USN-5083-1

Ubuntu Security Notice USN-5083-1
Posted Sep 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5083-1 - It was discovered that Python incorrectly handled certain RFCs. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 16.04 ESM. It was discovered that Python incorrectly handled certain server responses. An attacker could possibly use this issue to cause a denial of service.

tags | advisory, denial of service, python
systems | linux, ubuntu
advisories | CVE-2021-3733, CVE-2021-3737
SHA-256 | cf1c664ac3030e4cd34e05174e101afebd1645b1bdeba83b3242a64505d95995

Ubuntu Security Notice USN-5083-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5083-1
September 16, 2021

python3.4, python3.5 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Python.

Software Description:
- python3.5: An interactive high-level object-oriented language
- python3.4: An interactive high-level object-oriented language

Details:

It was discovered that Python incorrectly handled certain RFCs.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 16.04 ESM. (CVE-2021-3733)

It was discovered that Python incorrectly handled certain
server responses. An attacker could possibly use this issue to
cause a denial of service. (CVE-2021-3737)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
python3.5 3.5.2-2ubuntu0~16.04.13+esm1
python3.5-minimal 3.5.2-2ubuntu0~16.04.13+esm1

Ubuntu 14.04 ESM:
python3.4 3.4.3-1ubuntu1~14.04.7+esm11
python3.4-minimal 3.4.3-1ubuntu1~14.04.7+esm11

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5083-1
CVE-2021-3733, CVE-2021-3737
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