CVE-2020-28473 Web Cache Poisoning
Attackers can poison web caches via parameter cloaking in the Bottle framework, causing malicious responses to be served to other users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-28473?
CVE-2020-28473 is a medium-severity vulnerability in Debian Debian Linux, published on 18 Jan 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The package bottle from 0 and before 0.12.19 are vulnerable to Web Cache Poisoning by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.
Weakness: CWE-444
Which versions are affected by CVE-2020-28473?
3 open source packages ship an affected version, including bottle. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
bottle PyPI | All versions | 0.12.19 |
bottle PyPI | All versions | 0.12.19 |
bottle PyPI | All versions | 0.12.19 |
Linux distribution packages (3)
python-bottle SUSE:Linux Enterprise Module for Desktop Applications 15 SP2 | All versions | 0.12.13-3.3.1 |
python-bottle SUSE:Linux Enterprise Module for Python 2 15 SP2 | All versions | 0.12.13-3.3.1 |
python-bottle openSUSE:Leap 15.2 | All versions | 0.12.13-lp152.4.3.1 |
Products include Bottlepy Bottle, Debian Debian Linux.
How do I fix CVE-2020-28473?
Upgrade bottle to 0.12.19 or later.
Is CVE-2020-28473 being exploited?
There is no known exploitation of CVE-2020-28473 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2020-28473, DLA-2531-1, GHSA-qhx9-7hx7-cp4r, MGASA-2021-0171, OESA-2021-1067, PYSEC-2021-129 and 5 more.