CVE-2020-7694

Description

This affects all versions of package uvicorn. The request logger provided by the package is vulnerable to ASNI escape sequence injection. Whenever any HTTP request is received, the default behaviour of uvicorn is to log its details to either the console or a log file. When attackers request crafted URLs with percent-encoded escape sequences, the logging component will log the URL after it's been processed with urllib.parse.unquote, therefore converting any percent-encoded characters into their single-character equivalent, which can have special meaning in terminal emulators. By requesting URLs with crafted paths, attackers can: * Pollute uvicorn's access logs, therefore jeopardising the integrity of such files. * Use ANSI sequence codes to attempt to interact with the terminal emulator that's displaying the logs (either in real time or from a file).

How to fix CVE-2020-7694

To remediate CVE-2020-7694, upgrade the affected package to a fixed version below.

• —upgrade to 0.13.3-1 or later
• —upgrade to 0.11.7 or later
• —upgrade to 0.11.7 or later

Is CVE-2020-7694 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 0.13.3-1
• from 0, < 0.11.7
• from 0, < 0.11.7

CVSS scores

References (8)

• ADVISORYgithub.com/advisories/GHSA-33c7-2mpw-hg34
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-7694
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2020-7694
• PATCHgithub.com/encode/uvicorn
• WEB