A xrdp security update has been released for Ubuntu Linux 14.04 LTS, 16.04 LTS, 18.04 LTS, 20.04 LTS, and 22.04 LTS.

[USN-6474-1] xrdp vulnerabilities

==========================================================================
Ubuntu Security Notice USN-6474-1
November 08, 2023

xrdp vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS (Available with Ubuntu Pro)
- Ubuntu 20.04 LTS (Available with Ubuntu Pro)
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in xrdp.

Software Description:
- xrdp: Remote Desktop Protocol (RDP) server

Details:

It was discovered that xrdp incorrectly handled validation of
client-supplied data, which could lead to out-of-bounds reads. An attacker
could possibly use this issue to crash the program or extract sensitive
information. (CVE-2022-23479, CVE-2022-23481, CVE-2022-23483,
CVE-2023-42822)

It was discovered that xrdp improperly handled session establishment
errors. An attacker could potentially use this issue to bypass the
OS-level session restrictions by PAM. (CVE-2023-40184)

It was discovered that xrdp incorrectly handled validation of
client-supplied data, which could lead to out-of-bounds writes. An attacker
could possibly use this issue to cause memory corruption or execute
arbitrary code. This issue only affected Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-23468)

It was discovered that xrdp incorrectly handled validation of
client-supplied data, which could lead to out-of-bounds reads. An attacker
could possibly use this issue to crash the program or extract sensitive
information. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS
and Ubuntu 22.04 LTS. (CVE-2022-23480, CVE-2022-23482, CVE-2022-23484)

It was discovered that xrdp incorrectly handled validation of
client-supplied data, which could lead to out-of-bounds reads. An attacker
could possibly use this issue to crash the program or extract sensitive
information. This issue only affected Ubuntu 20.04 LTS and
Ubuntu 22.04 LTS. (CVE-2022-23477, CVE-2022-23493)

It was discovered that xrdp incorrectly handled validation of
client-supplied data, which could lead to out-of-bounds writes. An attacker
could possibly use this issue to cause memory corruption or execute
arbitrary code. This issue only affected Ubuntu 20.04 LTS and
Ubuntu 22.04 LTS. (CVE-2022-23478)

It was discovered that xrdp incorrectly handled validation of
client-supplied data, which could lead to out-of-bounds reads. An attacker
could possibly use this issue to crash the program or extract sensitive
information. This issue only affected Ubuntu 22.04 LTS. (CVE-2022-23613)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS (Available with Ubuntu Pro):
xrdp 0.9.17-2ubuntu2+esm1

Ubuntu 20.04 LTS (Available with Ubuntu Pro):
xrdp 0.9.12-1ubuntu0.1+esm1

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
xrdp 0.9.5-2ubuntu0.1~esm2

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
xrdp 0.6.1-2ubuntu0.3+esm3

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
xrdp 0.6.0-1ubuntu0.1+esm3

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6474-1
CVE-2022-23468, CVE-2022-23477, CVE-2022-23478, CVE-2022-23479,
CVE-2022-23480, CVE-2022-23481, CVE-2022-23482, CVE-2022-23483,
CVE-2022-23484, CVE-2022-23493, CVE-2022-23613, CVE-2023-40184,
CVE-2023-42822