CVE-2024-6387 regreSSHion: Openssh: regresshion - race condition in ssh allows rce/dos
High 8.1
Published
Updated
Check this codebase for CVE-2024-6387 (regreSSHion) and fix it if it is affected.
What it is: CVE-2024-6387 (regreSSHion) is a high-severity vulnerability in Apple Macos, published on 1 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-6387 exists.
Affected product: Apple Macos. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2024-6387/ (Markdown: https://insights.sbomify.com/CVE-2024-6387/index.md)
Unauthenticated remote attackers can exploit a race condition in OpenSSH to achieve remote code execution or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-6387?
CVE-2024-6387 (regreSSHion) is a high-severity vulnerability in Apple Macos, published on 1 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.
Which versions are affected by CVE-2024-6387?
It affects 53 products.
Linux distribution packages (40)
openssh AlmaLinux:9 | All versions | 8.7p1-38.el9_4.1 |
openssh-askpass AlmaLinux:9 | All versions | 8.7p1-38.el9_4.1 |
openssh-clients AlmaLinux:9 | All versions | 8.7p1-38.el9_4.1 |
openssh-keycat AlmaLinux:9 | All versions | 8.7p1-38.el9_4.1 |
openssh-server AlmaLinux:9 | All versions | 8.7p1-38.el9_4.1 |
pam_ssh_agent_auth AlmaLinux:9 | All versions | 0.10.4-5.38.el9_4.1 |
openssh-askpass Red Hat:enterprise_linux:9::appstream | All versions | 0:8.7p1-38.el9_4.1 |
openssh-askpass-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:8.7p1-38.el9_4.1 |
openssh-clients-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:8.7p1-38.el9_4.1 |
openssh-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:8.7p1-38.el9_4.1 |
openssh-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:8.7p1-38.el9_4.1 |
openssh-keycat-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:8.7p1-38.el9_4.1 |
openssh-server-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:8.7p1-38.el9_4.1 |
openssh-sk-dummy-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:8.7p1-38.el9_4.1 |
pam_ssh_agent_auth Red Hat:enterprise_linux:9::appstream | All versions | 0:0.10.4-5.38.el9_4.1 |
pam_ssh_agent_auth-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:0.10.4-5.38.el9_4.1 |
openssh Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-askpass-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-clients Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-clients-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-debugsource Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-keycat Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-keycat-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-server Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-server-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
openssh-sk-dummy-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:8.7p1-38.el9_4.1 |
pam_ssh_agent_auth-debuginfo Red Hat:enterprise_linux:9::baseos | All versions | 0:0.10.4-5.38.el9_4.1 |
openssh-askpass Red Hat:rhel_e4s:9.0::appstream | All versions | 0:8.7p1-12.el9_0.1 |
openssh-askpass-debuginfo Red Hat:rhel_e4s:9.0::appstream | All versions | 0:8.7p1-12.el9_0.1 |
openssh-clients-debuginfo Red Hat:rhel_e4s:9.0::appstream | All versions | 0:8.7p1-12.el9_0.1 |
openssh-debuginfo Red Hat:rhel_e4s:9.0::appstream | All versions | 0:8.7p1-12.el9_0.1 |
openssh-debugsource Red Hat:rhel_e4s:9.0::appstream | All versions | 0:8.7p1-12.el9_0.1 |
openssh-keycat-debuginfo Red Hat:rhel_e4s:9.0::appstream | All versions | 0:8.7p1-12.el9_0.1 |
openssh-server-debuginfo Red Hat:rhel_e4s:9.0::appstream | All versions | 0:8.7p1-12.el9_0.1 |
pam_ssh_agent_auth Red Hat:rhel_e4s:9.0::appstream | All versions | 0:0.10.4-4.12.el9_0.1 |
pam_ssh_agent_auth-debuginfo Red Hat:rhel_e4s:9.0::appstream | All versions | 0:0.10.4-4.12.el9_0.1 |
openssh Red Hat:rhel_e4s:9.0::baseos | All versions | 0:8.7p1-12.el9_0.1 |
openssh-askpass-debuginfo Red Hat:rhel_e4s:9.0::baseos | All versions | 0:8.7p1-12.el9_0.1 |
openssh-clients Red Hat:rhel_e4s:9.0::baseos | All versions | 0:8.7p1-12.el9_0.1 |
Products include Almalinux Almalinux, Amazon Amazon Linux, Apple Macos, Arista Eos, Canonical Ubuntu Linux, Debian Debian Linux and 47 more.
How do I fix CVE-2024-6387?
Apply the vendor's patch.
Is CVE-2024-6387 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-6387 exists.
Public exploit code: 1 Exploit-DB entry and 97 proofs of concept on GitHub.
Other vulnerabilities in Apple Macos
- CVE-2024-12084 Rsync: heap buffer overflow in rsync due to improper checksum length handling
- CVE-2024-12085 Rsync: info leak via uninitialized stack contents
- CVE-2024-12087 Rsync: path traversal vulnerability in rsync
- CVE-2024-12088 Rsync: --safe-links option bypass leads to path traversal
- CVE-2024-12086 Rsync: rsync server leaks arbitrary client files
Sources
Also known as ALPINE-CVE-2024-6387, ALSA-2024:4312, AZL-43024, AZL-43030, BELL-CVE-2024-6387, CLSA-2024-1720093829 and 17 more.