UBUNTU-CVE-2020-28473

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    UBUNTU-CVE-2020-28473

    Published: 18 Jan 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-28473
    Aliases:
    USN-5105-1

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2020-28473, https://snyk.io/vuln/SNYK-PYTHON-BOTTLE-1017108, https://github.com/bottlepy/bottle, https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/, https://ubuntu.com/security/notices/USN-5105-1, https://www.cve.org/CVERecord?id=CVE-2020-28473

    Affected packages

    Package

    Name: python-bottle

    Purl: pkg:deb/ubuntu/[email protected]~esm2?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.12.0-1ubuntu0.1~esm2

    Affected versions

    0.11.6-1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2020-28473 | CVE-DB