^{CVE-2023-26076:}Buffer Overflow Vulnerability in Samsung Mobile Chipset and Baseband Modem Chipset

Overview

This vulnerability affects Samsung's Exynos chipsets, specifically Exynos 1280, Exynos 2200, Exynos Modem 5123, Exynos Modem 5300, and Exynos Auto T5123. The issue is related to how the baseband processor handles 5G Session Management (SM) messages. When processing these messages, the system fails to properly validate parameters when decoding reserved options, leading to an intra-object buffer overflow. This vulnerability is particularly concerning because it could potentially be exploited remotely over the cellular network without requiring any user interaction, potentially giving attackers control over affected devices. Google Project Zero researchers identified this vulnerability as part of a series of baseband remote code execution vulnerabilities.

Remediation

Device manufacturers and carriers should apply security patches provided by Samsung for affected chipsets. End users should:

1. Ensure their devices are updated with the latest security patches
2. If patches are not available, consider disabling VoLTE and Wi-Fi Calling features temporarily as a mitigation measure
3. Monitor for and install security updates as soon as they become available
4. Organizations using affected devices in sensitive environments should assess the risk and consider additional network-level protections

Samsung has released security updates addressing this vulnerability through their Product Security Updates channel. Users and administrators should check Samsung's security advisory for specific patch information and apply updates as soon as possible.

References

1. Samsung Product Security Updates: https://semiconductor.samsung.com/support/quality-support/product-security-updates/
2. Google Project Zero Blog Post: https://googleprojectzero.blogspot.com/2023/03/multiple-internet-to-baseband-remote-rce.html
3. Packet Storm Security Details: http://packetstormsecurity.com/files/171400/Shannon-Baseband-NrSmPcoCodec-Intra-Object-Overflow.html
4. Samsung Mobile Processor Information: https://semiconductor.samsung.com/processor/mobile-processor/
5. Samsung Modem Information: https://semiconductor.samsung.com/processor/modem/