CVE-2019-18348

MEDIUM

Python 2.x < 2.7.17 - CRLF Injection via urllib/urllib2 URL Host Component

Title source: llm
STIX 2.1

Description

An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. 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 host component of a URL) followed by an HTTP header. This is similar to the CVE-2019-9740 query string issue and the CVE-2019-9947 path string issue. (This is not exploitable when glibc has CVE-2016-10739 fixed.). This is fixed in: v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1; v3.6.11, v3.6.11rc1, v3.6.12; v3.7.8, v3.7.8rc1, v3.7.9; v3.8.3, v3.8.3rc1, v3.8.4, v3.8.4rc1, v3.8.5, v3.8.6, v3.8.6rc1.

References (13)

Core 13
Core References
Technical Description vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4333-1/
Technical Description vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4333-2/
Mailing List, Technical Description vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00041.html
Mailing List, Technical Description mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html
Technical Description x_refsource_misc
https://www.oracle.com/security-alerts/cpuoct2020.html
Issue Tracking, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1727276
Issue Tracking, Vendor Advisory x_refsource_misc
https://bugs.python.org/issue30458#msg347282
Technical Description x_refsource_confirm
https://security.netapp.com/advisory/ntap-20191107-0004/

Scores

CVSS v3 6.1
EPSS 0.0267
EPSS Percentile 86.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-74
Status published
Products (1)
python/python 2.0 - 2.7.17
Published Oct 23, 2019
Tracked Since Feb 18, 2026