Vulnerability identifier: #VU77305

Vulnerability risk: High

CVSSv3.1: 7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-28473

CWE-ID: CWE-444

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Bottle
Server applications / Frameworks for developing and running applications

Vendor:

Description

The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.

The vulnerability exists due to the usage of a vector called parameter cloaking. A remote attacker can trick the victim into opening a specially crafted HTTP request, smuggle arbitrary HTTP headers and cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://github.com/bottlepy/bottle
http://lists.debian.org/debian-lts-announce/2021/01/msg00019.html
http://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/
http://snyk.io/vuln/SNYK-PYTHON-BOTTLE-1017108

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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.