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Update issues/CVE-2024-1086.md #29

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neil merged 1 commits from solardiz-patch-27 into main 2024-04-18 15:37:27 +00:00
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docs/issues/CVE-2024-1086.md
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@ -14,9 +14,14 @@ Exploitation of the flaw is [described in great detail in a blog post by Notselw
Public disclosure date: March 26, 2024 for the above blog post, which made the issue widely known Public disclosure date: March 26, 2024 for the above blog post, which made the issue widely known
## Status ## EL9
Both EL9 and EL8 are affected. We will of course rebuild upstream's fix as soon as it arrives. Affected. We will of course rebuild upstream's fix as soon as it arrives. Meanwhile, please refer to the mitigations below.
## EL8
- Fixed in version: `kernel-4.18.0-513.24.1.el8_9` available April 5, 2024
- Errata: [RLSA-2024:1607](https://errata.rockylinux.org/RLSA-2024:1607) issued April 5, 2024
## Mitigation ## Mitigation
@ -30,7 +35,9 @@ sysctl -p /etc/sysctl.d/userns.conf
``` ```
This is a mitigation also suggested by Red Hat. This is a mitigation also suggested by Red Hat.
It is expected to fully mitigate this and other/future related vulnerabilities. It is sufficient to fully mitigate this and other/future related vulnerabilities.
- If you cannot disable user namespaces, you may nevertheless be able to [disable network namespaces](https://www.openwall.com/lists/oss-security/2024/04/14/1), which is also sufficient to fully mitigate this and some other/future related vulnerabilities.
- Install our [package of LKRG](../packages/lkrg.md), start and enable the service. - Install our [package of LKRG](../packages/lkrg.md), start and enable the service.
@ -38,3 +45,5 @@ This does not fully mitigate the vulnerability,
but it reliably prevents the specific exploit referenced above from working and produces LKRG alerts when the exploit is run. but it reliably prevents the specific exploit referenced above from working and produces LKRG alerts when the exploit is run.
LKRG's feature that does so is its allow list for the kernel's usermodehelper. LKRG's feature that does so is its allow list for the kernel's usermodehelper.
This will similarly prevent other/future exploits that abuse usermodehelper. This will similarly prevent other/future exploits that abuse usermodehelper.
The remaining risks are Denial of Service (DoS) as even interrupted exploits may leave the system in an unstable state,
and a different exploit of the same vulnerability bypassing LKRG.