CRLF injection in Python - CVE-2019-9947

Vulnerability identifier: #VU18828

CSH Severity: Medium

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-9947

CWE-ID: CWE-93

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform CRLF injection attacks.

The vulnerability exists within urllib2 implementation for Python 2.x and urllib3 implementation for Python 3.x when processing the path component of a URL that lacks the "?" character within the urllib.request.urlopen() call. A remote attacker with ability to control URL, passed to the application, can use CRLF sequences to split the HTTP request and inject arbitrary HTTP headers into request, made by the application.

Python
Amazon Linux AMI
Gentoo Linux
Fedora
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Power, little endian
Ubuntu
Opensuse
Red Hat Software Collections
python (Red Hat package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
python3.11 (Ubuntu package)
python3.8-minimal (Ubuntu package)
python3.9 (Ubuntu package)
python3.8 (Ubuntu package)
python3.9-minimal (Ubuntu package)
python3.6 (Ubuntu package)
python3.6-minimal (Ubuntu package)
python3.7 (Ubuntu package)
python3.7-minimal (Ubuntu package)
python3.11-minimal (Ubuntu package)
python3.5 (Ubuntu package)
python3.5-minimal (Ubuntu package)
python27-python-jinja2 (Red Hat package)
python27-python (Red Hat package)
python34
python3
python3.10-minimal (Ubuntu package)
python3.10 (Ubuntu package)
python3.12-minimal (Ubuntu package)
python3.12 (Ubuntu package)
BIG-IP
Data Computing Appliance (DCA)
IBM Robotic Process Automation

Install update from vendor's website.

python (Red Hat package) - addressed in versions 2.7.5-63.el7_4, 2.7.5-74.el7_5, 2.7.5-83.el7_6
python3.11 (Ubuntu package) - addressed in versions Ubuntu Pro, 3.11.6-3ubuntu0.1
python3.8-minimal (Ubuntu package) - addressed in versions Ubuntu Pro, 3.8.10-0ubuntu1~20.04.10
python3.9 (Ubuntu package) - update to Ubuntu Pro
python3.8 (Ubuntu package) - addressed in versions Ubuntu Pro, 3.8.10-0ubuntu1~20.04.10
python3.9-minimal (Ubuntu package) - update to Ubuntu Pro
python3.6 (Ubuntu package) - update to Ubuntu Pro
python3.6-minimal (Ubuntu package) - update to Ubuntu Pro
python3.7 (Ubuntu package) - update to Ubuntu Pro
python3.7-minimal (Ubuntu package) - update to Ubuntu Pro
python3.11-minimal (Ubuntu package) - addressed in versions Ubuntu Pro, 3.11.6-3ubuntu0.1
python3.5 (Ubuntu package) - update to Ubuntu Pro (Infra-only)
python3.5-minimal (Ubuntu package) - update to Ubuntu Pro
python27-python-jinja2 (Red Hat package) - addressed in versions 2.6-12.el6, 2.6-15.el7
python27-python (Red Hat package) - addressed in versions 2.7.16-4.el6, 2.7.16-4.el7
python34 - addressed in versions 3.4.10-4.el6, 3.4.10-4.el7
python3 - addressed in versions 3.7.3-3.fc29, 3.7.3-3.fc30
python3.10-minimal (Ubuntu package) - update to 3.10.12-1~22.04.4
python3.10 (Ubuntu package) - update to 3.10.12-1~22.04.4
python3.12-minimal (Ubuntu package) - update to 3.12.0-1ubuntu0.1
python3.12 (Ubuntu package) - update to 3.12.0-1ubuntu0.1
Data Computing Appliance (DCA) - update to 4.3.0.0
IBM Robotic Process Automation - update to 21.0.5

• https://access.redhat.com/errata/RHSA-2019:1260
• https://bugs.python.org/issue35906
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/
• https://security.netapp.com/advisory/ntap-20190404-0004/

• Multiple vulnerabilities in Python
• Amazon Linux AMI update for python27
• Amazon Linux AMI update for python35
• Amazon Linux AMI update for python34
• Red Hat update for python
• Red Hat update for python3
• Red Hat update for rh-python36-python
• OpenSUSE Linux update for python
• OpenSUSE Linux update for python
• Gentoo update for Python
• Red Hat Enterprise Linux 7 update for python
• Red Hat Enterprise Linux 7 update for python
• Red Hat Enterprise Linux 7 update for python
• Amazon Linux AMI update for python34, python35
• Amazon Linux AMI update for python36
• Multiple vulnerabilities in Dell EMC Data Computing Appliance (DCA)
• Multiple vulnerabilities in IBM Robotic Process Automation for Cloud Pak
• Red Hat Software Collections update for python27-python and python27-python-jinja2
• Ubuntu update for python3.10
• Red Hat Enterprise Linux 8 update for the python27:2.7 module
• Fedora 30 update for python3
• Fedora 29 update for python3
• Fedora EPEL 6 update for python34
• Fedora EPEL 7 update for python34
• Multiple vulnerabilities in F5 BIG-IP Python component