medium
6.5
CWE
93 113
Advisory Published
CVE Published
Updated

CVE-2019-9947: CRLF Injection

First published: Sat Mar 23 2019(Updated: )

An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.2. 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 path component of a URL) followed by an HTTP header or a Redis command. This is similar to <a href="https://access.redhat.com/security/cve/CVE-2019-9740">CVE-2019-9740</a> query string issue. Reference: <a href="https://bugs.python.org/issue35906">https://bugs.python.org/issue35906</a>

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/python<0:2.7.5-86.el7
0:2.7.5-86.el7
redhat/python<0:2.7.5-63.el7_4
0:2.7.5-63.el7_4
redhat/python<0:2.7.5-74.el7_5
0:2.7.5-74.el7_5
redhat/python<0:2.7.5-83.el7_6
0:2.7.5-83.el7_6
redhat/python3<0:3.6.8-15.1.el8
0:3.6.8-15.1.el8
redhat/python27-python<0:2.7.16-4.el6
0:2.7.16-4.el6
redhat/python27-python-jinja2<0:2.6-12.el6
0:2.6-12.el6
redhat/rh-python36-python<0:3.6.9-2.el6
0:3.6.9-2.el6
redhat/python27-python<0:2.7.16-4.el7
0:2.7.16-4.el7
redhat/python27-python-jinja2<0:2.6-15.el7
0:2.6-15.el7
redhat/rh-python36-python<0:3.6.9-2.el7
0:3.6.9-2.el7
Python Python>=2.7.0<2.7.17
Python Python>=3.5.0<3.5.8
Python Python>=3.6.0<3.6.9
Python Python>=3.7.0<3.7.4
debian/python2.7
2.7.18-8+deb11u1

Remedy

https://bugs.python.org/issue35906

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2019-9947?

    CVE-2019-9947 is a vulnerability in urllib2 in Python 2.x and urllib in Python 3.x that allows for CRLF injection if the attacker controls a URL parameter.

  • What is the severity of CVE-2019-9947?

    CVE-2019-9947 has a severity score of 6.5 (medium).

  • Which versions of Python are affected by CVE-2019-9947?

    Python 2.x versions up to 2.7.16 and Python 3.x versions up to 3.7.3 are affected by CVE-2019-9947.

  • How can CRLF injection be prevented in urllib2 and urllib?

    To prevent CRLF injection in urllib2 and urllib, it is recommended to carefully validate and sanitize user-supplied input before using it in a URL.

  • Where can I find more information about CVE-2019-9947?

    You can find more information about CVE-2019-9947 on the Red Hat Security Advisory website and the Python bug tracker.

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