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CVE-2020-4044

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-6469-1
Posted Nov 13, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6469-1 - Ashley Newson discovered that xrdp incorrectly handled memory when processing certain incoming connections. An attacker could possibly use this issue to cause a denial of service or arbitrary code execution.

tags | advisory, denial of service, arbitrary, code execution
systems | linux, ubuntu
advisories | CVE-2020-4044
SHA-256 | 27f22e8c4599953e60c42928e27a91e4846b71c55ab10ff261b55486e50e373b
Download | Favorite | View
Debian Security Advisory 4737-1
Posted Jul 28, 2020
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4737-1 - Ashley Newson discovered that the XRDP sessions manager was susceptible to denial of service. A local attacker can further take advantage of this flaw to impersonate the XRDP sessions manager and capture any user credentials that are submitted to XRDP, approve or reject arbitrary login credentials or to hijack existing sessions for xorgxrdp sessions.

tags | advisory, denial of service, arbitrary, local
systems | linux, debian
advisories | CVE-2020-4044
SHA-256 | 86f96365681dacb8d32cdae9fe2abe14c91547d447b127933e2db1853dfdd01d
Download | Favorite | View
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