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    CVE-2019-19521

    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).

    Published:Dec 4, 2019
    Last Modified:Nov 21, 2024
    EPS:Dec 4, 2019
    EPSS Score:0.00539
    CVSS Score:9.8

    Affected Products

    Vendor
    Openbsd
    Product
    Openbsd

    Exploits

    http://www.openwall.com/lists/oss-security/2019/12/04/5https://seclists.org/bugtraq/2019/Dec/8https://www.openwall.com/lists/oss-security/2019/12/04/5http://www.openwall.com/lists/oss-security/2019/12/04/5https://seclists.org/bugtraq/2019/Dec/8https://www.openwall.com/lists/oss-security/2019/12/04/5

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-56101 (CVSS 6) — OpenBSD before commit 1ee99df contains an inverted comparison vulnerability in the ieee80211_michael_mic_failu…
    CVE-2026-57589 (CVSS 7.4) — sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. T…
    CVE-2026-55706 (CVSS 5.8) — sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zer…
    CVE-2026-41285 (CVSS 4.3) — In OpenBSD through 7.8, the slaacd and rad daemons have an infinite loop when they receive a crafted ICMPv6 Ne…
    CVE-2025-67901 (CVSS 5.3) — openrsync through 0.5.0, as used in OpenBSD through 7.8 and on other platforms, allows a client to cause a ser…
    CVE-2025-30334 (CVSS 7.1) — In OpenBSD 7.6 before errata 006 and OpenBSD 7.5 before errata 015, traffic sent over wg(4) could result in ke…
    CVE-2024-11149 (CVSS 6.2) — In OpenBSD 7.4 before errata 014, vmm(4) did not restore GDTR limits properly on Intel (VMX) CPUs.…
    CVE-2024-10933 (CVSS 4.1) — In OpenBSD 7.5 before errata 009 and OpenBSD 7.4 before errata 022, exclude any '/' in readdir name validation…
    CVE-2024-11148 (CVSS 8.7) — In OpenBSD 7.4 before errata 006 and OpenBSD 7.3 before errata 020, httpd(8) is vulnerable to a NULL dereferen…
    CVE-2024-10934 (CVSS 9.2) — In OpenBSD 7.5 before errata 008 and OpenBSD 7.4 before errata 021, avoid possible mbuf double free in NFS cl…

    References

    http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
    http://seclists.org/fulldisclosure/2019/Dec/14
    http://www.openwall.com/lists/oss-security/2019/12/04/5
    http://www.openwall.com/lists/oss-security/2019/12/04/6
    https://seclists.org/bugtraq/2019/Dec/8
    https://www.openbsd.org/errata66.html
    https://www.openwall.com/lists/oss-security/2019/12/04/5
    http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
    http://seclists.org/fulldisclosure/2019/Dec/14
    http://www.openwall.com/lists/oss-security/2019/12/04/5
    http://www.openwall.com/lists/oss-security/2019/12/04/6
    https://seclists.org/bugtraq/2019/Dec/8
    https://www.openbsd.org/errata66.html
    https://www.openwall.com/lists/oss-security/2019/12/04/5

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High