Executive Summary

[{'type': 'paragraph', 'content': "The vulnerability in CVE-2026-29121 involves the International Data Casting (IDC) SFX2100 satellite receiver's `/sbin/ip` utility, which is installed with the setuid bit set. This means any local user executing this binary gains elevated privileges."}, {'type': 'paragraph', 'content': 'Specifically, the `ip` executable does not drop elevated privileges when run with sudo or with the SUID bit set, allowing a local attacker to escalate privileges by spawning interactive shells within network namespaces or reading privileged files on the local filesystem.'}, {'type': 'paragraph', 'content': 'The exploit requires the Linux kernel to have network namespaces enabled (`CONFIG_NET_NS=y`). Using commands like `ip netns exec foo /bin/sh -p`, an attacker can gain a root shell. Additionally, the attacker can read files with elevated privileges using `ip -force -batch /path/to/input-file`.'}] [1]

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Impact Analysis

This vulnerability allows a local attacker to escalate their privileges to root on the affected system.

• Gain root shell access by exploiting network namespaces.
• Perform privileged file reads on the local filesystem, potentially exposing sensitive data.
• Potentially execute other privileged actions due to retained elevated privileges.

Overall, this can lead to full system compromise by any local user who can execute the vulnerable binary.

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability can be detected by checking if the `/sbin/ip` utility is installed with the setuid bit set, which grants elevated privileges to local users.

You can test the vulnerability by attempting to spawn a privileged shell or read files using the `ip` command with network namespaces or batch file reading options.

• Check if the `ip` binary has the SUID bit set: `ls -l /sbin/ip`
• Attempt to spawn a privileged shell using network namespaces: ``` ip netns add foo ip netns exec foo /bin/sh -p ip netns delete foo ```
• Attempt to read a file with elevated privileges: ``` ip -force -batch /path/to/input-file ```

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Mitigation Strategies

Immediate mitigation steps include removing the setuid bit from the `/sbin/ip` binary to prevent it from running with elevated privileges.

Alternatively, restrict local user access to the vulnerable binary or apply system updates or patches that address this privilege escalation issue.

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