CVE-2019-9740

moderate-risk

Published 2019-03-13

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.

Do I need to act?

9.9% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 6.1/10 Medium

NETWORK / LOW complexity

Affected Products (1)

Python

Affected Vendors

Python

References (58)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00041.html

Third Party Advisory http://packetstormsecurity.com/files/154927/Slackware-Security-Advisory-python-U...

Mailing List http://www.openwall.com/lists/oss-security/2021/02/04/2

Third Party Advisory http://www.securityfocus.com/bid/107466

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1260

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2030

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:3335

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:3520

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:3725

Exploit https://bugs.python.org/issue36276

Mailing List https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html

Mailing List https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html

Mailing List https://lists.debian.org/debian-lts-announce/2019/06/msg00026.html

Mailing List https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html

Mailing List https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

and 38 more references

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moderate-risk

Severity 23/34 · High

Exploitability 11/34 · Low

Exposure 5/34 · Minimal