CVE-2020-7694 Information

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: LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks Pollute uvicorn’s access logs therefore jeopardising the integrity of such files. LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks 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).

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://github.com/encode/uvicorn https://snyk.io/vuln/SNYK-PYTHON-UVICORN-575560 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: LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks Pollute uvicorn’s access logs therefore jeopardising the integrity of such files. LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks 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).

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5