CVE-2024-47659
Linux Kernel vulnerability
- Published9 Oct 2024
Description
In the Linux kernel, the following vulnerability has been resolved: smack: tcp: ipv4, fix incorrect labeling Currently, Smack mirrors the label of incoming tcp/ipv4 connections: when a label 'foo' connects to a label 'bar' with tcp/ipv4, 'foo' always gets 'foo' in returned ipv4 packets. So, 1) returned packets are incorrectly labeled ('foo' instead of 'bar') 2) 'bar' can write to 'foo' without being authorized to write. Here is a scenario how to see this: * Take two machines, let's call them C and S, with active Smack in the default state (no settings, no rules, no labeled hosts, only builtin labels) * At S, add Smack rule 'foo bar w' (labels 'foo' and 'bar' are instantiated at S at this moment) * At S, at label 'bar', launch a program that listens for incoming tcp/ipv4 connections * From C, at label 'foo', connect to the listener at S. (label 'foo' is instantiated at C at this moment) Connection succeedes and works. * Send some data in both directions. * Collect network traffic of this connection. All packets in both directions are labeled with the CIPSO of the label 'foo'. Hence, label 'bar' writes to 'foo' without being authorized, and even without ever being known at C. If anybody cares: exactly the same happens with DCCP. This behavior 1st manifested in release 2.6.29.4 (see Fixes below) and it looks unintentional. At least, no explanation was provided. I changed returned packes label into the 'bar', to bring it into line with the Smack documentation claims.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NAffected products
Remediation
- https://git.kernel.org/stable/c/0776bcf9cb6de46fdd94d10118de1cf9b05f83b9
- https://git.kernel.org/stable/c/0aea09e82eafa50a373fc8a4b84c1d4734751e2c
- https://git.kernel.org/stable/c/2fe209d0ad2e2729f7e22b9b31a86cc3ff0db550
- https://git.kernel.org/stable/c/4be9fd15c3c88775bdf6fa37acabe6de85beebff
- https://git.kernel.org/stable/c/5b4b304f196c070342e32a4752e1fa2e22fc0671
- https://git.kernel.org/stable/c/a948ec993541db4ef392b555c37a1186f4d61670
References
- https://git.kernel.org/stable/c/0776bcf9cb6de46fdd94d10118de1cf9b05f83b9
- https://git.kernel.org/stable/c/0aea09e82eafa50a373fc8a4b84c1d4734751e2c
- https://git.kernel.org/stable/c/2fe209d0ad2e2729f7e22b9b31a86cc3ff0db550
- https://git.kernel.org/stable/c/4be9fd15c3c88775bdf6fa37acabe6de85beebff
- https://git.kernel.org/stable/c/5b4b304f196c070342e32a4752e1fa2e22fc0671
- https://git.kernel.org/stable/c/a948ec993541db4ef392b555c37a1186f4d61670
- https://git.kernel.org/stable/c/d3703fa94116fed91f64c7d1c7d284fb4369070f
- https://git.kernel.org/stable/c/d3f56c653c65f170b172d3c23120bc64ada645d8
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Frequently asked
Is CVE-2024-47659 being actively exploited?
CVE-2024-47659 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.78%.
How severe is CVE-2024-47659?
CVE-2024-47659 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.78% probability of exploitation.
Which products are affected by CVE-2024-47659?
Affected products include Linux Kernel.
How do I fix CVE-2024-47659?
Upgrade affected software to a fixed version, for example Linux Kernel 5.4.284 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2024-47659 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.