CRLF injection in urllib3 - CVE-2019-11236
Published: March 26, 2020 / Updated: June 20, 2021
Vulnerability identifier: #VU26412
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2019-11236
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: urlib3
Affected software:
urllib3
urllib3
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a spoofing attack.
The vulnerability exists due to insufficient filtration of user-supplied data passed via HTTP request parameters to urllib3 library. A remote attacker can pass specially crafted data that contains CRLF sequences and perform a spoofing attack.
How to mitigate CVE-2019-11236
Install updates from vendor's website.
Sources
- https://github.com/urllib3/urllib3/issues/1553
- https://lists.debian.org/debian-lts-announce/2019/06/msg00016.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R62XGEYPUTXMRHGX5I37EBCGQ5COHGKR/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TBI45HO533KYHNB5YRO43TBYKA3E3VRL/
- https://usn.ubuntu.com/3990-1/