CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
AI Score
Confidence
Low
SSVC
Exploitation
none
Automatable
no
Technical Impact
partial
xrdp is an open source remote desktop protocol (RDP) server. In versions prior to 0.9.23 improper handling of session establishment errors allows bypassing OS-level session restrictions. The auth_start_session
function can return non-zero (1) value on, e.g., PAM error which may result in in session restrictions such as max concurrent sessions per user by PAM (ex ./etc/security/limits.conf) to be bypassed. Users (administrators) don’t use restrictions by PAM are not affected. This issue has been addressed in release version 0.9.23. Users are advised to upgrade. There are no known workarounds for this issue.
github.com/neutrinolabs/xrdp/blame/9bbb2ec68f390504c32f2062847aa3d821a0089a/sesman/sesexec/session.c#L571C5-L571C19
github.com/neutrinolabs/xrdp/commit/a111a0fdfe2421ef600e40708b5f0168594cfb23
github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jq
lists.fedoraproject.org/archives/list/[email protected]/message/SOT237TIHTHPX5YNIWLVNINOEYC7WMG2/
lists.fedoraproject.org/archives/list/[email protected]/message/U5IXMQODV3OIJ7DRQBUQV7PUKNT7SH36/
lists.fedoraproject.org/archives/list/[email protected]/message/URO3FKTFBPNKFARAQBEJLI4MH6YS35P5/
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
AI Score
Confidence
Low
SSVC
Exploitation
none
Automatable
no
Technical Impact
partial