Improper Authentication in xrdp - CVE-2017-6967
Published: March 17, 2017 / Updated: August 8, 2020
Vulnerability identifier: #VU39449
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-6967
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
xrdp 0.9.1 calls the PAM function auth_start_session() in an incorrect location, leading to PAM session modules not being properly initialized, with a potential consequence of incorrect configurations or elevation of privileges, aka a pam_limits.so bypass.
Affected software
xrdp
Fedora
xorgxrdp
xrdp
Fedora
xorgxrdp
xrdp
How to mitigate CVE-2017-6967
Install update from vendor's website.
xorgxrdp - addressed in versions 0.2.1-1.el7, 0.2.1-1.fc24, 0.2.1-1.fc25, 0.2.1-1.fc26
xrdp - addressed in versions 0.9.2-5.el7, 0.9.2-5.fc24, 0.9.2-5.fc25, 0.9.2-5.fc26
xrdp - addressed in versions 0.9.2-5.el7, 0.9.2-5.fc24, 0.9.2-5.fc25, 0.9.2-5.fc26