PT-2020-6147 · Ltsp+1 · Ltsp Ldm+1

Veeti Veteläinen · Published 2020-01-09 · Updated 2020-09-22 · CVE-2019-20373

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions LTSP LDM versions prior to 2.18.07

Description The issue is related to the run-x-session script and allows for fat-client root access due to the potential empty value of the LDM USERNAME variable if the user's shell lacks support for Bourne shell syntax. This is a result of insecure privilege management, which can be exploited to elevate privileges to the level of a superuser.

Recommendations For LTSP LDM versions prior to 2.18.07, update to version 2.18.07 or later to resolve the issue. As a temporary workaround, consider restricting access to the run-x-session script until a patch is available.

Fix

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

BDU:2021-03181

CVE-2019-20373

DLA-2064-1

DSA-4601-1

USN-4533-1

Affected Products

Ltsp Ldm

Ubuntu

References · 15

• https://git.launchpad.net/~ltsp-upstream/ltsp/+git/ldm/commit/?id=c351ac69ef63ed6c84221cef73e409059661b8ba · Patch
• https://debian.org/security/2020/dsa-4601 · Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2020/01/msg00007.html · Patch
• https://osv.dev/vulnerability/CVE-2019-20373 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-20373 · Security Note
• https://ubuntu.com/security/CVE-2019-20373 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4601-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-03181 · Security Note
• https://ubuntu.com/security/notices/USN-4533-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-20373 · Security Note
• https://osv.dev/vulnerability/DLA-2064-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-20373 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4533-1 · Vendor Advisory
• https://bugs.launchpad.net/ubuntu/+source/ldm/+bug/1839431 · Note
• https://launchpad.net/bugs/1839431 · Note