#VU77305 Inconsistent interpretation of HTTP requests in Bottle - CVE-2020-28473

Vulnerability identifier: #VU77305

Vulnerability risk: High

CVSSv4.0: 2.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

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: Bottle Micro Web Framework

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

Bottle: before 0.12.19

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