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CVE-2024-6387

Date: July 1, 2024

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.

Language: C

Severity Score

8.1

Related Resources (83)

Url: http://www.openwall.com/lists/oss-security/2024/07/01/12

Url: http://www.openwall.com/lists/oss-security/2024/07/10/1

Url: http://www.openwall.com/lists/oss-security/2024/07/01/13

Url: https://access.redhat.com/errata/RHSA-2024:4340

Url: http://www.openwall.com/lists/oss-security/2024/07/10/2

Url: https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-002.txt.asc

Url: https://github.com/AlmaLinux/updates/issues/629

Url: http://www.openwall.com/lists/oss-security/2024/07/10/6

Url: http://www.openwall.com/lists/oss-security/2024/07/10/3

Url: http://www.openwall.com/lists/oss-security/2024/07/10/4

Url: https://bugzilla.redhat.com/show_bug.cgi?id=2294604

Url: https://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution/

Url: http://www.openwall.com/lists/oss-security/2024/07/09/5

Url: https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt

Url: https://www.exploit-db.com/exploits/52269

Url: https://github.com/oracle/oracle-linux/issues/149

Url: https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server

Url: https://support.apple.com/kb/HT214120

Url: https://github.com/rapier1/hpn-ssh/issues/87

Url: https://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux/

Url: https://github.com/microsoft/azurelinux/issues/9555

Url: http://www.openwall.com/lists/oss-security/2024/07/23/4

Url: http://seclists.org/fulldisclosure/2024/Jul/18

Url: http://www.openwall.com/lists/oss-security/2024/07/04/1

Url: http://seclists.org/fulldisclosure/2024/Jul/19

Url: http://www.openwall.com/lists/oss-security/2024/07/02/1

Url: https://packetstorm.news/files/id/190587/

Url: https://github.com/openela-main/openssh/commit/e1f438970e5a337a17070a637c1b9e19697cad09

Url: http://www.openwall.com/lists/oss-security/2024/07/04/2

Url: https://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-do

Url: http://www.openwall.com/lists/oss-security/2024/07/23/6

Url: https://ubuntu.com/security/CVE-2024-6387

Url: https://security.netapp.com/advisory/ntap-20240701-0001/

Url: https://forum.vmssoftware.com/viewtopic.php?f=8&t=9132

Url: https://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100

Url: http://www.openwall.com/lists/oss-security/2024/07/08/2

Url: http://www.openwall.com/lists/oss-security/2024/07/08/3

Url: https://github.com/Azure/AKS/issues/4379

Url: https://lists.mindrot.org/pipermail/openssh-unix-dev/2024-July/041431.html

Url: https://sig-security.rocky.page/issues/CVE-2024-6387/

Url: http://www.openwall.com/lists/oss-security/2024/07/11/1

Url: https://explore.alas.aws.amazon.com/CVE-2024-6387.html

Url: http://www.openwall.com/lists/oss-security/2024/07/03/11

Url: https://access.redhat.com/errata/RHSA-2024:4484

Url: https://security-tracker.debian.org/tracker/CVE-2024-6387

Url: http://www.openwall.com/lists/oss-security/2024/07/11/3

Url: https://news.ycombinator.com/item?id=40843778

Url: https://security.alpinelinux.org/vuln/CVE-2024-6387

Url: https://github.com/openssh/openssh-portable/commit/81c1099d22b81ebfd20a334ce986c4f753b0db29

Url: https://archlinux.org/news/the-sshd-service-needs-to-be-restarted-after-upgrading-to-openssh-98p1/

Url: https://www.theregister.com/2024/07/01/regresshion_openssh/

Url: https://access.redhat.com/errata/RHSA-2024:4479

Url: https://access.redhat.com/errata/RHSA-2024:4312

Url: https://www.vicarius.io/vsociety/posts/regresshion-an-openssh-regression-error-cve-2024-6387

Url: https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html

Url: http://seclists.org/fulldisclosure/2024/Jul/20

Url: https://www.openssh.com/txt/release-9.8

Url: https://www.suse.com/security/cve/CVE-2024-6387.html

Url: https://lists.almalinux.org/archives/list/announce@lists.almalinux.org/thread/23BF5BMGFVEVUI2WNVAGMLKT557EU7VY/

Url: https://github.com/PowerShell/Win32-OpenSSH/issues/2249

Url: https://support.apple.com/kb/HT214118

Url: http://www.openwall.com/lists/oss-security/2024/07/03/1

Url: http://www.openwall.com/lists/oss-security/2024/07/03/2

Url: https://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.asc

Url: https://nvd.nist.gov/vuln/detail/CVE-2024-6387

Url: https://access.redhat.com/errata/RHSA-2024:4474

Url: http://www.openwall.com/lists/oss-security/2024/07/03/5

Url: http://www.openwall.com/lists/oss-security/2024/07/28/3

Url: http://www.openwall.com/lists/oss-security/2024/07/28/2

Url: http://www.openwall.com/lists/oss-security/2024/07/03/3

Url: https://github.com/zgzhang/cve-2024-6387-poc

Url: http://www.openwall.com/lists/oss-security/2024/07/03/4

Url: https://support.apple.com/kb/HT214119

Url: https://ubuntu.com/security/notices/USN-6859-1

Url: https://www.splunk.com/en_us/blog/security/cve-2024-6387-regresshion-vulnerability.html

Url: http://www.openwall.com/lists/oss-security/2024/07/09/2

Url: https://github.com/PowerShell/Win32-OpenSSH/discussions/2248

Url: https://access.redhat.com/security/cve/CVE-2024-6387

Url: https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0010

Url: https://access.redhat.com/errata/RHSA-2024:4469

Url: https://access.redhat.com/errata/RHSA-2024:4389

Url: https://santandersecurityresearch.github.io/blog/sshing_the_masses.html

Url: https://www.mend.io/vulnerability-database/CVE-2024-6387

Severity Score

8.1

Weakness Type (CWE)

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-362

Signal Handler Race Condition

CWE-364

CVSS v3.1

Base Score:	8.1
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	HIGH
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	HIGH
Availability (A):	HIGH

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