CVE-2024-47659

Updated: 2024-11-04 13:36:48.800351

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.


Links NIST CIRCL RHEL Ubuntu

Severity

Severity Score
CVSS Version 2.x 0
CVSS Version 3.x HIGH 8.8

Status

OS name Project name Version Score Severity Status Errata Last updated

Statement

AlmaLinux 9.2 ESU kernel 5.14.0 8.8 HIGH Needs Triage 2024-11-04 09:45:34
AlmaLinux 9.2 FIPS kernel 5.14.0 8.8 HIGH Not Vulnerable 2024-12-04 12:09:22
CentOS 6 ELS kernel 2.6.32 8.8 HIGH Not Vulnerable 2024-11-27 11:59:25
CentOS 7 ELS kernel 3.10.0 8.8 HIGH Released CLSA-2024:1731348593 2024-11-26 12:01:33
CentOS 8.4 ELS kernel 4.18.0 8.8 HIGH Needs Triage 2024-11-04 09:45:37
CentOS 8.5 ELS kernel 4.18.0 8.8 HIGH Needs Triage 2024-11-04 09:45:35
CentOS Stream 8 ELS kernel 4.18.0 8.8 HIGH Not Vulnerable 2024-11-07 04:34:17
CloudLinux 6 ELS kernel 2.6.32 8.8 HIGH Not Vulnerable 2024-11-27 11:59:25
CloudLinux 7 ELS kernel 3.10.0 8.8 HIGH Needs Triage 2024-11-04 09:45:42
Oracle Linux 6 ELS kernel 2.6.32 8.8 HIGH Not Vulnerable 2024-11-27 11:59:23
Total: 14