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Submission: On July 18 via api from IN — Scanned from DE
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CVE-2024-6409 Public on Last Modified: UTC ModerateModerate ImpactWhat does this mean? 7.0CVSS Score Breakdown INSIGHTS VULNERABILITY ANALYSIS View exposed systems DESCRIPTION A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server. A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server. STATEMENT Red Hat rates the severity of this flaw as Moderate for both Red Hat Enterprise Linux (RHEL) and OpenShift Container Platform (OCP). While there are many similarities to CVE-2024-6387, the important difference is that any possible remote code execution is limited to an unprivileged child of the SSHD server. This additional restriction on access reduces the overall security impact. This vulnerability only affects the versions of OpenSSH shipped with Red Hat Enterprise Linux 9. Upstream versions of sshd are not impacted by this flaw. The affected versions of OCP are 4.13, 4.14, 4.15, and 4.16 while 4.12 and earlier versions of OCP are not affected. Red Hat rates the severity of this flaw as Moderate for both Red Hat Enterprise Linux (RHEL) and OpenShift Container Platform (OCP). While there are many similarities to CVE-2024-6387, the important difference is that any possible remote code execution is limited to an unprivileged child of the SSHD server. This additional restriction on access reduces the overall security impact. This vulnerability only affects the versions of OpenSSH shipped with Red Hat Enterprise Linux 9. Upstream versions of sshd are not impacted by this flaw. The affected versions of OCP are 4.13, 4.14, 4.15, and 4.16 while 4.12 and earlier versions of OCP are not affected. MITIGATION The process is identical to CVE-2024-6387, by disabling LoginGraceTime. See that CVE page for additional details. ADDITIONAL INFORMATION * Bugzilla 2295085: openssh: Possible remote code execution due to a race condition in signal handling affecting Red Hat Enterprise Linux 9 * CWE-364: Signal Handler Race Condition * FAQ: Frequently asked questions about CVE-2024-6409 EXTERNAL REFERENCES * https://www.cve.org/CVERecord?id=CVE-2024-6409 * https://nvd.nist.gov/vuln/detail/CVE-2024-6409 COMMON VULNERABILITY SCORING SYSTEM (CVSS) SCORE DETAILS IMPORTANT NOTE CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications). CVSS v3 Score BreakdownRed HatNVD CVSS v3 Base Score 7.0 N/A Attack Vector Network N/A Attack Complexity High N/A Privileges Required None N/A User Interaction None N/A Scope Unchanged N/A Confidentiality Impact Low N/A Integrity Impact Low N/A Availability Impact High N/A CVSS V3 VECTOR Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H FREQUENTLY ASKED QUESTIONS WHY IS RED HAT'S CVSS V3 SCORE OR IMPACT DIFFERENT FROM OTHER VENDORS? For open source software shipped by multiple vendors, the CVSS base scores may vary for each vendor's version depending on the version they ship, how they ship it, the platform, and even how the software is compiled. This makes scoring of vulnerabilities difficult for third-party vulnerability databases such as NVD that only provide a single CVSS base score for each vulnerability. Red Hat scores reflect how a vulnerability affects our products specifically. For more information, see https://access.redhat.com/solutions/762393. MY PRODUCT IS LISTED AS "UNDER INVESTIGATION" OR "AFFECTED", WHEN WILL RED HAT RELEASE A FIX FOR THIS VULNERABILITY? * "Under investigation" doesn't necessarily mean that the product is affected by this vulnerability. It only means that our Analysis Team is still working on determining whether the product is affected and how it is affected. * "Affected" means that our Analysis Team has determined that this product is affected by this vulnerability and might release a fix to address this in the near future. WHAT CAN I DO IF MY PRODUCT IS LISTED AS "WILL NOT FIX"? This depends mostly on the Impact of the vulnerability and the Life Cycle phase in which your product is currently in. Overall, you have the following options: * Upgrade to a supported product version that includes a fix for this vulnerability (recommended) * Apply a mitigation (if one exists) * Open a support case to request a prioritization of releasing a fix for this vulnerability WHAT IS A MITIGATION? A mitigation is an action that can be taken to reduce the impact of a security vulnerability, without deploying any fixes. I HAVE A RED HAT PRODUCT BUT IT IS NOT IN THE ABOVE LIST, IS IT AFFECTED? The listed products were found to include one or more of the components that this vulnerability affects. These products underwent a thorough evaluation to determine their affectedness by this vulnerability. Note that layered products (such as container-based offerings) that consume affected components from any of the products listed in this table may be affected and are not represented. WHY IS MY SECURITY SCANNER REPORTING MY PRODUCT AS VULNERABLE TO THIS VULNERABILITY EVEN THOUGH MY PRODUCT VERSION IS FIXED OR NOT AFFECTED? In order to maintain code stability and compatibility, Red Hat usually does not rebase packages to entirely new versions. Instead, we backport fixes and new features to an older version of the package we distribute. This can result in some security scanners that only consider the package version to report the package as vulnerable. To avoid this, we suggest that you use an approved vulnerability scanner from our Red Hat Vulnerability Scanner Certification program. Not sure what something means? Check out our Security Glossary. This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact Red Hat Product Security. 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