CVE-2019-19521
OpenBSD libc Authentication Bypass Vulnerability
Description
libc in OpenBSD 6.6 allows authentication bypass via the -schallenge username, as demonstrated by smtpd, ldapd, or radiusd. This is related to gen/auth_subr.c and gen/authenticate.c in libc (and login/login.c and xenocara/app/xenodm/greeter/verify.c).
INFO
Published Date :
Dec. 5, 2019, 12:15 a.m.
Last Modified :
Dec. 12, 2019, 3:55 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2019-19521 has a 1 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-2019-19521.
| URL | Resource |
|---|---|
| http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html | Third Party Advisory |
| http://seclists.org/fulldisclosure/2019/Dec/14 | Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2019/12/04/5 | Exploit Mailing List Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2019/12/04/6 | Mailing List |
| https://seclists.org/bugtraq/2019/Dec/8 | Exploit Mailing List Third Party Advisory |
| https://www.openbsd.org/errata66.html | Vendor Advisory |
| https://www.openwall.com/lists/oss-security/2019/12/04/5 | Exploit Mailing List Third Party 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).
Yet Another Link Repo. Mainly Security Links
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2019-19521 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2019-19521 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 -
Initial Analysis by [email protected]
Dec. 12, 2019
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/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 http://www.openwall.com/lists/oss-security/2019/12/04/6 No Types Assigned http://www.openwall.com/lists/oss-security/2019/12/04/6 Mailing List 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/2019/12/04/6 [No Types Assigned] Added Reference http://www.openwall.com/lists/oss-security/2019/12/04/5 [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-2019-19521 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-2019-19521
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.47 }} 0.18%
score
0.85253
percentile