CVE-2019-19522
OpenBSD YubiKey Authentication Local Privilege Escalation
Description
OpenBSD 6.6, in a non-default configuration where S/Key or YubiKey authentication is enabled, allows local users to become root by leveraging membership in the auth group. This occurs because root's file can be written to /etc/skey or /var/db/yubikey, and need not be owned by root.
INFO
Published Date :
Dec. 5, 2019, 12:15 a.m.
Last Modified :
Nov. 21, 2024, 4:34 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Apply the latest OpenBSD security patches using the syspatch command. Alternatively, compile and apply the patches from source
Public PoC/Exploit Available at Github
CVE-2019-19522 has a 3 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2019-19522.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2019-19522 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-2019-19522
weaknesses.
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).
Script that automates the process of escalating privileges on openbsd system (CVE-2019-19520) by exploiting the xlock binary and againing it's sgid and escalating to the root user by (CVE-2019-19522) exploiting the privileges of auth group and adding keys to the Skey or Yubikey
Shell C
None
Various local exploits
linux local exploit root local-exploits
Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2019-19522 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2019-19522 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 af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html Added Reference http://seclists.org/fulldisclosure/2019/Dec/14 Added Reference http://www.openwall.com/lists/oss-security/2019/12/04/5 Added Reference https://seclists.org/bugtraq/2019/Dec/8 Added Reference https://www.openbsd.org/errata66.html Added Reference https://www.openwall.com/lists/oss-security/2019/12/04/5 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CWE Remap by [email protected]
Aug. 24, 2020
Action Type Old Value New Value Changed CWE CWE-287 CWE-732 -
Initial Analysis by [email protected]
Dec. 12, 2019
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html No Types Assigned http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html Third Party Advisory Changed Reference Type http://seclists.org/fulldisclosure/2019/Dec/14 No Types Assigned http://seclists.org/fulldisclosure/2019/Dec/14 Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2019/12/04/5 No Types Assigned http://www.openwall.com/lists/oss-security/2019/12/04/5 Exploit, Mailing List, Third Party Advisory Changed Reference Type https://seclists.org/bugtraq/2019/Dec/8 No Types Assigned https://seclists.org/bugtraq/2019/Dec/8 Exploit, Mailing List, Third Party Advisory Changed Reference Type https://www.openbsd.org/errata66.html No Types Assigned https://www.openbsd.org/errata66.html Vendor Advisory Changed Reference Type https://www.openwall.com/lists/oss-security/2019/12/04/5 No Types Assigned https://www.openwall.com/lists/oss-security/2019/12/04/5 Exploit, Mailing List, Third Party Advisory Added CWE NIST CWE-287 Added CPE Configuration OR *cpe:2.3:o:openbsd:openbsd:6.6:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Dec. 06, 2019
Action Type Old Value New Value Added Reference http://seclists.org/fulldisclosure/2019/Dec/14 [No Types Assigned] -
CVE Modified by [email protected]
Dec. 05, 2019
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html [No Types Assigned] -
CVE Modified by [email protected]
Dec. 05, 2019
Action Type Old Value New Value Added Reference https://seclists.org/bugtraq/2019/Dec/8 [No Types Assigned] -
CVE Modified by [email protected]
Dec. 05, 2019
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2019/12/04/5 [No Types Assigned]
Vulnerability Scoring Details
Base CVSS Score: 7.8
Base CVSS Score: 7.2
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.18 }} 0.06%
score
0.40351
percentile