Information disclosure in urllib3

1) Information disclosure

EUVDB-ID: #VU26413

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-20060

CWE-ID: CWE-200 - Information exposure

Exploit availability: Yes

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 - 1.22

External links

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

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.