Vulnerability Name:

CVE-2019-20373 (CCN-174251)

Assigned:2020-01-09
Published:2020-01-09
Updated:2020-01-24
Summary:LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have an empty value if the user's shell lacks support for Bourne shell syntax. This is related to a run-x-session script.
CVSS v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
7.7 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.2 High (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
9.0 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Gain Privileges
References:Source: MITRE
Type: CNA
CVE-2019-20373

Source: XF
Type: UNKNOWN
ltsp-ldm-cve201920373-priv-esc(174251)

Source: MISC
Type: Patch, Third Party Advisory
https://git.launchpad.net/~ltsp-upstream/ltsp/+git/ldm/commit/?id=c351ac69ef63ed6c84221cef73e409059661b8ba

Source: CCN
Type: Debian Mailing List, Fri, 10 Jan 2020 15:06:58 +0000
[DLA 2064-1] ldm security update

Source: MLIST
Type: Mailing List, Patch, Third Party Advisory
[debian-lts-announce] 20200110 [SECURITY] [DLA 2064-1] ldm security update

Source: CCN
Type: LTSP Web site
Linux Terminal Server Project

Source: DEBIAN
Type: Third Party Advisory
DSA-4601

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-20373

Vulnerable Configuration:Configuration 1:
  • cpe:/o:debian:debian_linux:8.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/a:ltsp:ldm:*:*:*:*:*:*:*:* (Version <= 2.18.06)

    • Configuration CCN 1:
  • cpe:/a:ltsp:ldm:2.18.06:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.disco:def:2019203730000000
    V
    		CVE-2019-20373 on Ubuntu 19.04 (disco) - medium.
    2020-01-09
    oval:com.ubuntu.bionic:def:2019203730000000
    V
    		CVE-2019-20373 on Ubuntu 18.04 LTS (bionic) - medium.
    2020-01-09
    oval:com.ubuntu.xenial:def:2019203730000000
    V
    		CVE-2019-20373 on Ubuntu 16.04 LTS (xenial) - medium.
    2020-01-09
    BACK
    debian debian linux 8.0
    debian debian linux 9.0
    debian debian linux 10.0
    ltsp ldm *
    ltsp ldm 2.18.06