CRLF Injection Affecting python3-libs package, versions <0:3.7.3-1.amzn2.0.2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.33% (72nd percentile)

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  • Snyk IDSNYK-AMZN2-PYTHON3LIBS-1671280
  • published27 Sept 2021
  • disclosed13 Mar 2019

Introduced: 13 Mar 2019

CVE-2019-9740  (opens in a new tab)
CWE-93  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 python3-libs to version 0:3.7.3-1.amzn2.0.2 or higher.
This issue was patched in ALAS2-2019-1247.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-libs package and not the python3-libs package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.

References

CVSS Scores

version 3.1