Loop with Unreachable Exit Condition ('Infinite Loop') Affecting python27:2.7/python2-pyyaml package, versions <0:3.12-16.module_el8.6.0+2781+fed64c13


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.53% (77th percentile)

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  • Snyk IDSNYK-ALMALINUX8-PYTHON27-5634671
  • published28 May 2023
  • disclosed3 Nov 2020

Introduced: 3 Nov 2020

CVE-2019-20907  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 python27:2.7/python2-pyyaml to version 0:3.12-16.module_el8.6.0+2781+fed64c13 or higher.
This issue was patched in ALSA-2020:4654.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python27:2.7/python2-pyyaml package and not the python27:2.7/python2-pyyaml package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

In Lib/tarfile.py in Python through 3.8.3, an attacker is able to craft a TAR archive leading to an infinite loop when opened by tarfile.open, because _proc_pax lacks header validation.

References

CVSS Scores

version 3.1