CVE-2019-9740

Published: 12 March 2019

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.

Priority

Medium

CVSS 3 base score: 6.1

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9740
• https://python-security.readthedocs.io/vuln/http-header-injection2.html
• https://ubuntu.com/security/notices/USN-4127-1
• https://ubuntu.com/security/notices/USN-4127-2
• NVD
• Launchpad
• Debian

Bugs

• https://bugs.python.org/issue36276 (marked as dupe)
• https://bugs.python.org/issue30458