flip off VoLTE, Wi-Fi calling on account of Exynos vulnerability

Google’s mission Zero workforce found extreme zero-day vulnerabilities with the Samsung Exynos modems used on the Pixel 6 and seven, Samsung telephones and wearables, and fully different devices that warrant disabling VoLTE and Wi-Fi calling till patched.

Exynos modem vulnerabilities

recognized for finding zero-days, mission Zero reported 18 vulnerabilities in Exynos modems in late 2022 and early 2023. 4 of the vulnerabilities, collectively with CVE-2023-24033, contain internet-to-baseband distant code execution (emphasis ours):

checks carried out by mission Zero confirm that these 4 vulnerabilities allow an attacker to remotely compromise a cellphone on the baseband diploma with no one interplay, and require solely that the attacker know the sufferer’s cellphone quantity. With restricted extra evaluation and development, we think about that expert attackers could be in a place to shortly create an operational exploit to compromise affected devices silently and remotely.

in the meantime, the selection 14 vulnerabilities are thought-about not as extreme as they “require both a malicious mobile community operator or an attacker with native entry to the machine.”

mission Zero is making a “coverage exception to delay disclosure for the 4 vulnerabilities that allow for internet-to-baseband distant code execution.” that is “on account of a very unusual combination of diploma of entry these vulnerabilities current and the velocity with which we think about a reliable operational exploit might very effectively be crafted.”

Affected devices

in response to Samsung Semiconductor (January 2023), these are the affected chipsets: Exynos Modem 5123, Exynos Modem 5300, Exynos 980, Exynos 1080, and Exynos Auto T5123. Google compiled a itemizing of probably affected merchandise:

  • Samsung Galaxy telephones collectively with these inside the S22, M33, M13, M12, A71, A53, A33, A21, A13, A12, and A04 collection
  • Vivo telephones collectively with these inside the S16, S15, S6, X70, X60, and X30 collection
  • Google Pixel 6 and 6 professional, Pixel 6a, Pixel 7 and seven professional
  • Any wearables that use the Exynos W920 chipset
  • Any automobiles that use the Exynos Auto T5123 chipset

moreover the Pixel 6 (Exynos 5123) and seven (Exynos 5300), this contains the S22, as effectively as to the Galaxy Watch 4 and 5. On Pixel telephones, the precept CVE-2023-24033 vulnerability was fixed with the March 2023 safety patch that rolled out on Monday however ought to have come every week earlier.

flip off VoLTE and Wi-Fi calling

nonetheless, the Pixel 6, 6 professional, and 6a have but to see that March replace and are at the second susceptible. mission Zero’s suggestion for these impacted follows: 

till safety updates can be found, clients who want to defend themselves from the baseband distant code execution vulnerabilities in Samsung’s Exynos chipsets can flip off Wi-Fi calling and Voice-over-LTE (VoLTE) of their machine settings. Turning off these settings will take away the exploitation risk of these vulnerabilities.

in response to an older dash/T-mobile assist article, “Google Pixel devices obtained computer software updates in 2021 that routinely enabled VoLTE and eliminated the toggle.” you will uncover a strategy to disable Wi-Fi calling on Pixel telephones in Settings app > community & internet > SIMs > Wi-Fi calling.


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