Bug 1855191 (CVE-2020-4044)

Summary:	CVE-2020-4044 xrdp: buffer overflow via malicious payloads
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bojan, itamar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2020-07-10 12:12:14 UTC	Type:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1855192
Bug Blocks:

Description Dhananjay Arunesh 2020-07-09 08:01:41 UTC

The xrdp-sesman service before version 0.9.13.1 can be crashed by connecting over port 3350 and supplying a malicious payload. Once the xrdp-sesman process is dead, an unprivileged attacker on the server could then proceed to start their own imposter sesman service listening on port 3350. This will allow them to capture any user credentials that are submitted to XRDP and approve or reject arbitrary login credentials. For xorgxrdp sessions in particular, this allows an unauthorized user to hijack an existing session. This is a buffer overflow attack, so there may be a risk of arbitrary code execution as well.

References:
https://github.com/neutrinolabs/xrdp/commit/0c791d073d0eb344ee7aaafd221513dc9226762c
https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.13.1
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4

Comment 1 Dhananjay Arunesh 2020-07-09 08:02:11 UTC

Created xrdp tracking bugs for this issue:

Affects: epel-6 [bug 1855192]

Comment 2 Bojan Smojver 2020-07-10 12:12:14 UTC

This package is no longer maintained in EPEL 6. Please use EPEL 7 or better.