9.8
CRITICAL
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 :

Nov. 21, 2024, 4:34 a.m.

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.

Affected Products

The following products are affected by CVE-2019-19521 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Openbsd openbsd
References to Advisories, Solutions, and Tools

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

Updated: 3 years, 1 month ago
0 stars 0 fork 0 watcher
Born at : Jan. 25, 2021, 7:57 p.m. This repo has been linked 2 different CVEs too.

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 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 http://www.openwall.com/lists/oss-security/2019/12/04/6
    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
  • 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]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
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:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

3.97 }} 2.16%

score

0.91932

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability