Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2020-4044

7.5 · HIGH

The xrdp-sesman service before version 0.9.13.1 can be crashed by connecting over port 3350 and supplying a malicious payload.

Published Jun 30, 2020CWE-121EPSS 2.40%

Overview

CVE-2020-4044 is a high-severity vulnerability. It was published on June 30, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2020-07/msg00036.htmlReflists.opensuse.org/opensuse-security-announce/2020-08/msg00037.htmlGitHubgithub.com/neutrinolabs/xrdp/commit/0c791d073d0eb344ee7aaafd221513dc9226762cGitHubgithub.com/neutrinolabs/xrdp/releases/tag/v0.9.13.1GitHubgithub.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4Reflists.debian.org/debian-lts-announce/2020/08/msg00015.htmlRefwww.debian.org/security/2020/dsa-4737Reflists.opensuse.org/opensuse-security-announce/2020-07/msg00036.htmlReflists.opensuse.org/opensuse-security-announce/2020-08/msg00037.htmlGitHubgithub.com/neutrinolabs/xrdp/commit/0c791d073d0eb344ee7aaafd221513dc9226762c

How CyberStrike helps

Frequently asked questions

What is CVE-2020-4044?

CVE-2020-4044 is a high-severity vulnerability. It was published on June 30, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2020-4044?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-4044?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-4044?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-4044 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2020

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999