CVE-2024-6387

A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.

• CWE-364
• CWE-362

• https://access.redhat.com/errata/RHSA-2024:4312Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4340Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4389Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4469Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4474Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4479Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4484Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2024-6387Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2294604Third Party Advisory
• https://santandersecurityresearch.github.io/blog/sshing_the_masses.htmlExploit, Third Party Advisory
• https://www.openssh.com/txt/release-9.8Release Notes, Third Party Advisory
• https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txtExploit, Third Party Advisory
• https://seclists.org/fulldisclosure/2024/Jul/18Mailing List
• https://seclists.org/fulldisclosure/2024/Jul/19Mailing List
• https://seclists.org/fulldisclosure/2024/Jul/20Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/01/12Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/01/13Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/02/1Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/03/1Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/03/11Exploit, Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/03/2Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/03/3Mailing List, Patch
• https://www.openwall.com/lists/oss-security/2024/07/03/4Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/03/5Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/04/1Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/04/2Exploit, Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/08/2Exploit, Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/08/3Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/09/2Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/09/5Exploit, Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/10/1Exploit, Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/10/2Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/10/3Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/10/4Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/10/6Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/11/1Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/11/3Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/23/4Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/23/6Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/28/2Mailing List
• https://www.openwall.com/lists/oss-security/2024/07/28/3Mailing List
• https://access.redhat.com/errata/RHSA-2024:4312Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4340Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4389Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4469Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4474Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4479Third Party Advisory
• https://access.redhat.com/errata/RHSA-2024:4484Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2024-6387Third Party Advisory
• https://archlinux.org/news/the-sshd-service-needs-to-be-restarted-after-upgrading-to-openssh-98p1/Third Party Advisory
• https://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux/Press/Media Coverage, Third Party Advisory
• https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-serverPress/Media Coverage, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2294604Third Party Advisory
• https://explore.alas.aws.amazon.com/CVE-2024-6387.htmlThird Party Advisory
• https://forum.vmssoftware.com/viewtopic.php?f=8&t=9132Issue Tracking
• https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-002.txt.ascRelease Notes
• https://github.com/AlmaLinux/updates/issues/629Issue Tracking
• https://github.com/Azure/AKS/issues/4379Issue Tracking
• https://github.com/PowerShell/Win32-OpenSSH/discussions/2248Issue Tracking
• https://github.com/PowerShell/Win32-OpenSSH/issues/2249Issue Tracking
• https://github.com/microsoft/azurelinux/issues/9555Issue Tracking
• https://github.com/openela-main/openssh/commit/e1f438970e5a337a17070a637c1b9e19697cad09Patch
• https://github.com/oracle/oracle-linux/issues/149Issue Tracking
• https://github.com/rapier1/hpn-ssh/issues/87Issue Tracking
• https://github.com/zgzhang/cve-2024-6387-pocThird Party Advisory
• https://lists.almalinux.org/archives/list/announce@lists.almalinux.org/thread/23BF5BMGFVEVUI2WNVAGMLKT557EU7VY/Third Party Advisory
• https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.htmlMailing List, Release Notes
• https://lists.mindrot.org/pipermail/openssh-unix-dev/2024-July/041431.htmlMailing List, Patch
• https://news.ycombinator.com/item?id=40843778Issue Tracking, Patch
• https://packetstorm.news/files/id/190587/Broken Link
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0010Third Party Advisory
• https://santandersecurityresearch.github.io/blog/sshing_the_masses.htmlExploit, Third Party Advisory
• https://security-tracker.debian.org/tracker/CVE-2024-6387Third Party Advisory
• https://security.netapp.com/advisory/ntap-20240701-0001/Third Party Advisory
• https://sig-security.rocky.page/issues/CVE-2024-6387/Third Party Advisory
• https://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution/Press/Media Coverage, Third Party Advisory
• https://support.apple.com/kb/HT214118Third Party Advisory
• https://support.apple.com/kb/HT214119Third Party Advisory
• https://support.apple.com/kb/HT214120Third Party Advisory
• https://ubuntu.com/security/CVE-2024-6387Third Party Advisory
• https://ubuntu.com/security/notices/USN-6859-1Third Party Advisory
• https://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-doThird Party Advisory
• https://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100Third Party Advisory
• https://www.exploit-db.com/exploits/52269Exploit
• https://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.ascThird Party Advisory
• https://www.openssh.com/txt/release-9.8Release Notes, Third Party Advisory
• https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txtExploit, Third Party Advisory
• https://www.splunk.com/en_us/blog/security/cve-2024-6387-regresshion-vulnerability.htmlThird Party Advisory
• https://www.suse.com/security/cve/CVE-2024-6387.htmlThird Party Advisory
• https://www.theregister.com/2024/07/01/regresshion_openssh/Press/Media Coverage, Third Party Advisory
• https://www.vicarius.io/vsociety/posts/regresshion-an-openssh-regression-error-cve-2024-6387Exploit, Third Party Advisory
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-446545.html

Published

Jul 1, 2024

Last Modified

Oct 15, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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