CVE-2024-47659

Technical 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.

* Coll

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References