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Vulnerability Intelligence

CVE-2024-6387

HIGH8.1

Openssh: regresshion - race condition in ssh allows rce/dos

Published Jul 1, 2024

Modified 1 months ago

No fix available

Details

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.

References

WEBhttp://seclists.org/fulldisclosure/2024/Jul/18 WEBhttp://seclists.org/fulldisclosure/2024/Jul/19 WEBhttp://seclists.org/fulldisclosure/2024/Jul/20 WEBhttp://www.openwall.com/lists/oss-security/2024/07/01/12 WEBhttp://www.openwall.com/lists/oss-security/2024/07/01/13 WEBhttp://www.openwall.com/lists/oss-security/2024/07/02/1 WEBhttp://www.openwall.com/lists/oss-security/2024/07/03/1 WEBhttp://www.openwall.com/lists/oss-security/2024/07/03/11 WEBhttp://www.openwall.com/lists/oss-security/2024/07/03/2 WEBhttp://www.openwall.com/lists/oss-security/2024/07/03/3 WEBhttp://www.openwall.com/lists/oss-security/2024/07/03/4 WEBhttp://www.openwall.com/lists/oss-security/2024/07/03/5 WEBhttp://www.openwall.com/lists/oss-security/2024/07/04/1 WEBhttp://www.openwall.com/lists/oss-security/2024/07/04/2 WEBhttp://www.openwall.com/lists/oss-security/2024/07/08/2 WEBhttp://www.openwall.com/lists/oss-security/2024/07/08/3 WEBhttp://www.openwall.com/lists/oss-security/2024/07/09/2 WEBhttp://www.openwall.com/lists/oss-security/2024/07/09/5 WEBhttp://www.openwall.com/lists/oss-security/2024/07/10/1 WEBhttp://www.openwall.com/lists/oss-security/2024/07/10/2 WEBhttp://www.openwall.com/lists/oss-security/2024/07/10/3 WEBhttp://www.openwall.com/lists/oss-security/2024/07/10/4 WEBhttp://www.openwall.com/lists/oss-security/2024/07/10/6 WEBhttp://www.openwall.com/lists/oss-security/2024/07/11/1 WEBhttp://www.openwall.com/lists/oss-security/2024/07/11/3 WEBhttp://www.openwall.com/lists/oss-security/2024/07/23/4 WEBhttp://www.openwall.com/lists/oss-security/2024/07/23/6 WEBhttp://www.openwall.com/lists/oss-security/2024/07/28/2 WEBhttp://www.openwall.com/lists/oss-security/2024/07/28/3 ADVISORYhttps://access.redhat.com/errata/RHSA-2024:4312 ADVISORYhttps://access.redhat.com/errata/RHSA-2024:4340 ADVISORYhttps://access.redhat.com/errata/RHSA-2024:4389 ADVISORYhttps://access.redhat.com/errata/RHSA-2024:4469 ADVISORYhttps://access.redhat.com/errata/RHSA-2024:4474 ADVISORYhttps://access.redhat.com/errata/RHSA-2024:4479 ADVISORYhttps://access.redhat.com/errata/RHSA-2024:4484 WEBhttps://access.redhat.com/security/cve/CVE-2024-6387 WEBhttps://archlinux.org/news/the-sshd-service-needs-to-be-restarted-after-upgrading-to-openssh-98p1/WEBhttps://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux/WEBhttps://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server WEBhttps://bugzilla.redhat.com/show_bug.cgi?id=2294604 WEBhttps://explore.alas.aws.amazon.com/CVE-2024-6387.html WEBhttps://forum.vmssoftware.com/viewtopic.php?f=8&t=9132 WEBhttps://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-002.txt.asc WEBhttps://github.com/AlmaLinux/updates/issues/629 WEBhttps://github.com/Azure/AKS/issues/4379 WEBhttps://github.com/PowerShell/Win32-OpenSSH/discussions/2248 WEBhttps://github.com/PowerShell/Win32-OpenSSH/issues/2249 WEBhttps://github.com/microsoft/azurelinux/issues/9555 WEBhttps://github.com/openela-main/openssh/commit/e1f438970e5a337a17070a637c1b9e19697cad09 WEBhttps://github.com/oracle/oracle-linux/issues/149 WEBhttps://github.com/rapier1/hpn-ssh/issues/87 WEBhttps://github.com/zgzhang/cve-2024-6387-poc WEBhttps://lists.almalinux.org/archives/list/announce@lists.almalinux.org/thread/23BF5BMGFVEVUI2WNVAGMLKT557EU7VY/WEBhttps://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html WEBhttps://lists.mindrot.org/pipermail/openssh-unix-dev/2024-July/041431.html WEBhttps://news.ycombinator.com/item?id=40843778 WEBhttps://packetstorm.news/files/id/190587/WEBhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0010 WEBhttps://santandersecurityresearch.github.io/blog/sshing_the_masses.html WEBhttps://security-tracker.debian.org/tracker/CVE-2024-6387 WEBhttps://security.netapp.com/advisory/ntap-20240701-0001/WEBhttps://sig-security.rocky.page/issues/CVE-2024-6387/WEBhttps://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution/WEBhttps://support.apple.com/kb/HT214118 WEBhttps://support.apple.com/kb/HT214119 WEBhttps://support.apple.com/kb/HT214120 WEBhttps://ubuntu.com/security/CVE-2024-6387 WEBhttps://ubuntu.com/security/notices/USN-6859-1 WEBhttps://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-do WEBhttps://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2024-6387 WEBhttps://www.exploit-db.com/exploits/52269 WEBhttps://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.asc WEBhttps://www.openssh.com/txt/release-9.8 WEBhttps://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt WEBhttps://www.splunk.com/en_us/blog/security/cve-2024-6387-regresshion-vulnerability.html WEBhttps://www.suse.com/security/cve/CVE-2024-6387.html WEBhttps://www.theregister.com/2024/07/01/regresshion_openssh/WEBhttps://www.vicarius.io/vsociety/posts/regresshion-an-openssh-regression-error-cve-2024-6387

CVSS Analysis

CVSS v3.1

8.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

HighAC:H

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

8.1/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedJul 1, 2024

ModifiedDec 11, 2025

CVE-2024-6387 | Mondoo Vulnerability Intelligence