#VU31958 CRLF injection in Python - CVE-2019-18348
Vulnerability identifier: #VU31958
Vulnerability risk: Medium
CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2019-18348
CWE-ID:
CWE-74
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Python
Universal components / Libraries /
Scripting languages
Vendor: Python.org
Description
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
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 (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.)
Mitigation
Install update from vendor's website.
Vulnerable software versions
Python: 2.0 - 2.0.1, 2.1 - 2.1.3, 2.2 - 2.2.3, 2.3 - 2.3.7, 2.4 - 2.4.6, 2.5_release_candidate_1 - 2.5.150, 2.6 - 2.6.6150, 2.7 - 2.7.17, 3.0 - 3.0.1, 3.1 - 3.1.2150, 3.2 - 3.2.2150, 3.3 - 3.3.7, 3.4 - 3.4.10, 3.5 - 3.5.9, 3.6 - 3.6.11, 3.7 - 3.7.8, 3.8 - 3.8.0
External links
https://lists.opensuse.org/opensuse-security-announce/2020-05/msg00041.html
https://bugs.python.org/issue30458#msg347282
https://bugzilla.redhat.com/show_bug.cgi?id=1727276
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4X3HW5JRZ7GCPSR7UHJOLD7AWLTQCDVR/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JCPGLTTOBB3QEARDX4JOYURP6ELNNA2V/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M34WOYCDKTDE5KLUACE2YIEH7D37KHRX/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/
https://security.netapp.com/advisory/ntap-20191107-0004/
https://usn.ubuntu.com/4333-1/
https://usn.ubuntu.com/4333-2/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
