CVE-2019-18348

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.

How to fix CVE-2019-18348

To remediate CVE-2019-18348, upgrade the affected package to a fixed version below.

• —upgrade to 2.7.18-r0 or later
• —upgrade to 2.7.18~rc1-1 or later

Is CVE-2019-18348 being exploited?

Low — EPSS is 2.2%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 2.7.18-r0
• from 0, < 2.7.18~rc1-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-18348
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-18348