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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.

Last Modified: UTC

CVE description copyright © 2021



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