Vulnerability Report

CVE-2017-20002

Title: Debian Shadow Auth Bypass

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2017-20002.

CWE Category CWE-269
Published Date Mar 17, 2021
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 7.8 CVSS v3.1
Exploit Probability (EPSS)
0.40%

Vulnerability Summary

CVE-2017-20002: The Debian shadow package before 1:4.5-1 for Shadow incorrectly lists pts/0 and pts/1 as physical terminals in /etc/securetty. This allows local users to login as password-less users even if they are connected by non-physical means such as SSH (hence bypassing PAM's nullok_secure configuration). This notably affects environments such as virtual machines automatically generated with a default blank root password, allowing all local users to escalate privileges.

Impacted Vendors

D
debian 1
S
shadow_project 1
B
blade-group 1

Reference Links

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957 https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957 https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.8
Attack Vector
LOCAL
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
4.6
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:L/AC:L/Au:N/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2017-20002 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector LOCAL
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.