Bug 1879683 (CVE-2020-7694)

Summary:	CVE-2020-7694 uvicorn: ANSI escape sequence injection
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	carl, lbalhar, python-sig
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2024-04-15 07:57:52 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1880964
Bug Blocks:	1879688

Description Guilherme de Almeida Suckevicz 2020-09-16 19:13:03 UTC

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).

References:
https://github.com/encode/uvicorn/issues/723
https://snyk.io/vuln/SNYK-PYTHON-UVICORN-575560

Comment 1 lnacshon 2020-09-21 09:40:11 UTC

Fix was pushed for this issue https://github.com/encode/uvicorn/pull/724/commits/175799fbfcd5c6107c711b570f04cd30f8cdfd09

Comment 3 Carl George 🤠 2020-11-10 03:00:47 UTC

This was fixed upstream in version 0.11.7.  Fedora packages this as python-uvicorn, but has never shipped an affected version.  The initial import (bug 1844308) was for version 0.11.8.