#VU32096 Key management errors in xcmsdb - CVE-2017-2625

Vulnerability identifier: #VU32096

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-2625

CWE-ID: CWE-320

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
xcmsdb
Other software / Other software solutions

Vendor: xorg.freedesktop.org

Description

The vulnerability allows a local authenticated user to gain access to sensitive information.

It was discovered that libXdmcp before 1.1.2 including used weak entropy to generate session keys. On a multi-user system using xdmcp, a local attacker could potentially use information available from the process list to brute force the key, allowing them to hijack other users' sessions.

Mitigation
Install update from vendor's website.

Vulnerable software versions

xcmsdb: 1.1.0 - 1.1.1

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External links
https://www.securityfocus.com/bid/96480
https://www.securitytracker.com/id/1037919
https://access.redhat.com/errata/RHSA-2017:1865
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2625
https://cgit.freedesktop.org/xorg/lib/libXdmcp/commit/?id=0554324ec6bbc2071f5d1f8ad211a1643e29eb1f
https://lists.debian.org/debian-lts-announce/2019/11/msg00024.html
https://security.gentoo.org/glsa/201704-03
https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.