#VU26413 Information disclosure in urllib3 - CVE-2018-20060

Vulnerability identifier: #VU26413

Vulnerability risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2018-20060

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
urllib3
Web applications / Modules and components for CMS

Vendor: urlib3

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to Authorization HTTP header is not removed from the HTTP request during request redirection in "urllib3/util/retry.py". A remote attacker can intercept the request and gain access to sensitive information, passed via Authorization HTTP header.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

urllib3: 1.10 - 1.10.4, 1.11, 1.12, 1.13 - 1.13.1, 1.14, 1.15 - 1.15.1, 1.16, 1.17, 1.18 - 1.18.1, 1.19 - 1.19.1, 1.20 - 1.22

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External links
https://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html
https://access.redhat.com/errata/RHSA-2019:2272
https://bugzilla.redhat.com/show_bug.cgi?id=1649153
https://github.com/urllib3/urllib3/blob/master/CHANGES.rst
https://github.com/urllib3/urllib3/issues/1316
https://github.com/urllib3/urllib3/pull/1346
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5SJERZEJDSUYQP7BNBXMBHRHGY26HRZD/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BXLAXHM3Z6DUCXZ7ZXZ2EAYJXWDCZFCT/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XWP36YW3KSVLXDBY3QJKDYEPCIMN3VQZ/
https://usn.ubuntu.com/3990-1/

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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. However, proof of concept for this vulnerability is available.