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# CVE-2024-6387: openssh
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## Title
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CVE-2024-6387: regreSSHion: remote code execution (RCE) in OpenSSH server, exploitable at least on glibc-based Linux systems
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## Summary
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As [discovered by Qualys](https://www.openwall.com/lists/oss-security/2024/07/01/3) and
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[summarized by OpenSSH upstream](https://www.openwall.com/lists/oss-security/2024/07/01/1):
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A critical vulnerability in sshd(8) was present in Portable OpenSSH versions 8.5p1 [to] 9.7p1 (inclusive) that may allow arbitrary code execution with root privileges.
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Successful exploitation has been demonstrated on 32-bit Linux/glibc systems with ASLR. Under lab conditions, the attack requires on average 6-8 hours of continuous connections up to the maximum the server will accept. Exploitation on 64-bit systems is believed to be possible but has not been demonstrated at this time. It's likely that these attacks will be improved upon.
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Public disclosure date: July 1, 2024
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## EL9
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- Fixed in version: `8.7p1-38.el9_4.security.0.5` available July 1, 2024
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## EL8
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- Unaffected
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## Mitigation
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Set `LoginGraceTime 0` in `/etc/ssh/sshd_config` and do a `systemctl restart sshd`.
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A drawback of this mitigation is that it will make the SSH server more susceptible to denial of service attacks.
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These are what we consider significant SIG/Security news items, not an exhaustive list of package updates and wiki edits.
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These are what we consider significant SIG/Security news items, not an exhaustive list of package updates and wiki edits.
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## July 1, 2024
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[openssh](packages/openssh.md) `8.7p1-38.el9_4.security.0.5` for EL9 adds a fix for [CVE-2024-6387 regreSSHion](issues/CVE-2024-6387.md).
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EL8 is unaffected.
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## June 13, 2024
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## June 13, 2024
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[glibc](packages/glibc.md) `2.34-100.2.el9_4.security.0.9` is a rebase on `2.34-100.el9_4.2`,
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[glibc](packages/glibc.md) `2.34-100.2.el9_4.security.0.9` is a rebase on `2.34-100.el9_4.2`,
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## EL9
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## EL9
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- Version `8.7p1-38.el9_4.security.0.5`
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- Version `8.7p1-38.el9_4.security.0.4`
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- Based on `8.7p1-38.el9`
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- Based on `8.7p1-38.el9`
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### Changes summary
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### Changes summary
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- Instead of linking against `libsystemd`, load it dynamically in a temporary child process to avoid polluting actual `sshd`'s address space with that library and its many dependencies (shortens `ldd sshd` output from 28 to 20 lines)
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- Instead of linking against `libsystemd`, load it dynamically in a temporary child process to avoid polluting actual `sshd`'s address space with that library and its many dependencies (shortens `ldd sshd` output from 28 to 20 lines)
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- Build without Kerberos support (further shortens `ldd sshd` from 20 to 13 lines)
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- Build without Kerberos support (further shortens `ldd sshd` from 20 to 13 lines)
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- Fix CVE-2024-6387 regreSSHion
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### Change log
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### Change log
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```
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```
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* Mon Jul 01 2024 Solar Designer <solar@openwall.com> 8.7p1-38.el9_4.security.0.5
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- Fix CVE-2024-6387 regreSSHion
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* Mon May 20 2024 Solar Designer <solar@openwall.com> 8.7p1-38.el9_4.security.0.4
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* Mon May 20 2024 Solar Designer <solar@openwall.com> 8.7p1-38.el9_4.security.0.4
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- Rebase on 8.7p1-38
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- Rebase on 8.7p1-38
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