CVE-2017-20002
Debian Shadow Pseudo-Terminal Privilege Escalation Vulnerability
Description
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.
INFO
Published Date :
March 17, 2021, 6:15 a.m.
Last Modified :
June 7, 2021, 2:58 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2017-20002.
| URL | Resource |
|---|---|
| https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374 | Mailing List Vendor Advisory |
| https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957 | Exploit Mailing List Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html | Mailing List Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2017-20002 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2017-20002 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Jun. 07, 2021
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:debian:shadow:*:*:*:*:*:*:*:* versions up to (excluding) 4.5-1 *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* OR *cpe:2.3:a:debian:shadow:4.4:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* -
Initial Analysis by [email protected]
Mar. 23, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374 No Types Assigned https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374 Mailing List, Vendor Advisory Changed Reference Type https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957 No Types Assigned https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957 Exploit, Mailing List, Vendor Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html Mailing List, Vendor Advisory Added CWE NIST CWE-269 Added CPE Configuration OR *cpe:2.3:a:debian:shadow:*:*:*:*:*:*:*:* versions up to (excluding) 4.5-1 *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Mar. 18, 2021
Action Type Old Value New Value Changed Description The Debian shadow package before 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. 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. -
CVE Modified by [email protected]
Mar. 17, 2021
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2017-20002 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2017-20002
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.05635
percentile