Login Request a demo
Critical severity · published Dec 5, 2019
CVE-2019-19521
libc in OpenBSD 6.6 allows authentication bypass via the -schallenge username, as demonstrated by smtpd, ldapd, or radiusd
9.8
CVSS
2.7%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.7% · higher than 86% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Openbsd · Openbsd
6.6 · source: NVD
Affected product
OP
Openbsd
Openbsd
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-19521
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-19521
Third Party Advisory
http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
Third Party Advisory
http://seclists.org/fulldisclosure/2019/Dec/14
Exploit
http://www.openwall.com/lists/oss-security/2019/12/04/5
Mailing List
http://www.openwall.com/lists/oss-security/2019/12/04/6
Exploit
https://seclists.org/bugtraq/2019/Dec/8
Vendor Advisory
https://www.openbsd.org/errata66.html
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