CVE-2019-9947

Published: 23 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 path component of a URL that lacks a ? character) followed by an HTTP header or a Redis command. This is similar to the CVE-2019-9740 query string issue. 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.

Notes

in certain python releases, introduced by:
https://github.com/python/cpython/commit/cc54c1c0d2d05fe7404ba64c53df4b1352ed2262

Same fix as CVE-2019-9740

Status

Severity score breakdown

References

• 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
• https://www.cve.org/CVERecord?id=CVE-2019-9947
• https://ubuntu.com/security/notices/USN-6891-1
• NVD
• Launchpad
• Debian

Bugs

• https://bugs.python.org/issue35906