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This vulnerability is currently awaiting analysis.
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.
Metrics
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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 intro
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 th
Added
Reference
Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:4457 [No types assigned]
CVE Modified by Red Hat, Inc.7/12/2024 10:15:16 AM
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 Red Hat, Inc.7/10/2024 4:15:04 PM
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 Red Hat, Inc.7/10/2024 1:15:12 PM
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 Red Hat, Inc.7/10/2024 12:15:04 PM
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 Red Hat, Inc.7/10/2024 9:15:10 AM
Action
Type
Old Value
New Value
Added
Reference
Red Hat, Inc. https://almalinux.org/blog/2024-07-09-cve-2024-6409/ [No types assigned]
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]
CVE Modified by Red Hat, Inc.7/09/2024 9:15:10 PM
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 Red Hat, Inc.7/09/2024 11:15:12 AM
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 a
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 intro
CVE Modified by Red Hat, Inc.7/09/2024 8:15:21 AM
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 Red Hat, Inc.7/09/2024 2:15:03 AM
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://security-tracker.debian.org/tracker/CVE-2024-6409 [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]
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 a
Added
Reference
Red Hat, Inc. http://www.openwall.com/lists/oss-security/2024/07/08/2 [No types assigned]
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]
Quick Info
CVE Dictionary Entry: CVE-2024-6409 NVD
Published Date: 07/08/2024 NVD
Last Modified: 09/12/2024
Source: Red Hat, Inc.
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