CVE-2024-6409
OpenSSH SSHD ASLR-RCE
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.
INFO
Published Date :
July 8, 2024, 6:15 p.m.
Last Modified :
Sept. 12, 2024, 8:15 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
4.7
Exploitability Score :
2.2
Public PoC/Exploit Available at Github
CVE-2024-6409 has a 8 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-6409.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
bulk scanning tool for 21 different CVE's for OpenSSH
Python
OpenSSH Vulnerabilities Scanner: Bulk Scanning Tool for 21 different OpenSSH CVEs.
Python
Bulk Scanning Tool for OpenSSH CVE-2024-6387, CVE-2024-6409, CVE-2006-5051, CVE-2008-4109, and 16 other CVEs.
Securiy Response Guideline for newly high-impacted vulnerabilities
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Shell
Hacker News
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Archived EGI SVG Advisories
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-6409 vulnerability anywhere in the article.
-
Cyber Security News
Critical OpenSSH Vulnerability in FreeBSD Let’s Attackers Gain Root Access Remotely
A critical security vulnerability has been discovered in OpenSSH implementations on FreeBSD systems, potentially allowing attackers to execute remote code without authentication. The vulnerability, id ... Read more
The following table lists the changes that have been made to the
CVE-2024-6409 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
Sep. 12, 2024
Action Type Old Value New Value Removed Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/08/2 Removed Reference Red Hat, Inc. https://explore.alas.aws.amazon.com/CVE-2024-6409.html Removed Reference Red Hat, Inc. https://sig-security.rocky.page/issues/CVE-2024-6409/ Removed Reference Red Hat, Inc. https://ubuntu.com/security/CVE-2024-6409 Removed Reference Red Hat, Inc. https://security-tracker.debian.org/tracker/CVE-2024-6409 Removed Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/09/2 Removed Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/09/5 Removed Reference Red Hat, Inc. https://bugzilla.suse.com/show_bug.cgi?id=1227217 Removed Reference Red Hat, Inc. https://www.suse.com/security/cve/CVE-2024-6409.html Removed Reference Red Hat, Inc. https://almalinux.org/blog/2024-07-09-cve-2024-6409/ Removed Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/10/1 Removed Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/10/2 Removed Reference Red Hat, Inc. https://github.com/openela-main/openssh/commit/c00da7741d42029e49047dd89e266d91dcfbffa0 Removed Reference Red Hat, Inc. https://security.netapp.com/advisory/ntap-20240712-0003/ -
CVE Modified by [email protected]
Aug. 22, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:5444 [No types assigned] -
CVE Modified by [email protected]
Aug. 07, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:4960 [No types assigned] -
CVE Modified by [email protected]
Aug. 07, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:4955 [No types assigned] -
CVE Modified by [email protected]
Aug. 02, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:4910 [No types assigned] -
CVE Modified by [email protected]
Jul. 24, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:4613 [No types assigned] -
CVE Modified by [email protected]
Jul. 23, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:4716 [No types assigned] -
CVE Modified by [email protected]
Jul. 13, 2024
Action Type Old Value New Value Changed Description A signal handler race condition vulnerability was found in OpenSSH's server (sshd) in Red Hat Enterprise Linux 9, where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). This issue leaves it vulnerable to a signal handler race condition on the cleanup_exit() function, which introduces the same vulnerability as CVE-2024-6387 in the unprivileged child of the SSHD server. As a consequence of a successful attack, in the worst case scenario, the attacker may be able to perform a remote code execution (RCE) within unprivileged user running the sshd server. This vulnerability affects only the sshd server shipped with Red Hat Enterprise Linux 9, while upstream versions of sshd are not impact by this flaw. 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. Added Reference Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:4457 [No types assigned] -
CVE Modified by [email protected]
Jul. 12, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://security.netapp.com/advisory/ntap-20240712-0003/ [No types assigned] -
CVE Modified by [email protected]
Jul. 10, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://github.com/openela-main/openssh/commit/c00da7741d42029e49047dd89e266d91dcfbffa0 [No types assigned] -
CVE Modified by [email protected]
Jul. 10, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/10/2 [No types assigned] -
CVE Modified by [email protected]
Jul. 10, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/10/1 [No types assigned] -
CVE Modified by [email protected]
Jul. 10, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://bugzilla.suse.com/show_bug.cgi?id=1227217 [No types assigned] Added Reference Red Hat, Inc. https://www.suse.com/security/cve/CVE-2024-6409.html [No types assigned] Added Reference Red Hat, Inc. https://almalinux.org/blog/2024-07-09-cve-2024-6409/ [No types assigned] -
CVE Modified by [email protected]
Jul. 10, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/09/5 [No types assigned] -
CVE Modified by [email protected]
Jul. 09, 2024
Action Type Old Value New Value Changed Description A signal handler race condition vulnerability was found in OpenSSH's server (sshd), where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). This issue leaves it vulnerable to a signal handler race condition on the cleanup_exit() function, which introduces the same vulnerability as CVE-2024-6387 in the unprivileged child of the SSHD server. A signal handler race condition vulnerability was found in OpenSSH's server (sshd) in Red Hat Enterprise Linux 9, where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). This issue leaves it vulnerable to a signal handler race condition on the cleanup_exit() function, which introduces the same vulnerability as CVE-2024-6387 in the unprivileged child of the SSHD server. As a consequence of a successful attack, in the worst case scenario, the attacker may be able to perform a remote code execution (RCE) within unprivileged user running the sshd server. This vulnerability affects only the sshd server shipped with Red Hat Enterprise Linux 9, while upstream versions of sshd are not impact by this flaw. -
CVE Modified by [email protected]
Jul. 09, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/09/2 [No types assigned] -
CVE Modified by [email protected]
Jul. 09, 2024
Action Type Old Value New Value Added Reference Red Hat, Inc. https://explore.alas.aws.amazon.com/CVE-2024-6409.html [No types assigned] Added Reference Red Hat, Inc. https://sig-security.rocky.page/issues/CVE-2024-6409/ [No types assigned] Added Reference Red Hat, Inc. https://ubuntu.com/security/CVE-2024-6409 [No types assigned] Added Reference Red Hat, Inc. https://security-tracker.debian.org/tracker/CVE-2024-6409 [No types assigned] -
CVE Received by [email protected]
Jul. 08, 2024
Action Type Old Value New Value Added Description A signal handler race condition vulnerability was found in OpenSSH's server (sshd), where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). This issue leaves it vulnerable to a signal handler race condition on the cleanup_exit() function, which introduces the same vulnerability as CVE-2024-6387 in the unprivileged child of the SSHD server. Added Reference Red Hat, Inc. https://access.redhat.com/security/cve/CVE-2024-6409 [No types assigned] Added Reference Red Hat, Inc. https://bugzilla.redhat.com/show_bug.cgi?id=2295085 [No types assigned] Added Reference Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/08/2 [No types assigned] Added CWE Red Hat, Inc. CWE-364 Added CVSS V3.1 Red Hat, Inc. AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-6409 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-6409
weaknesses.