Create: 2022-01-25 Update: 2025-06-27 23:47:11

⭕️ CVE-2021-4034: pwnkit: Local Privilege Escalation in polkit's pkexec

Внезапно подъехала действительно серьезная проблема повышения привилегий (LPE) до рута практически во всех линукс дистрибутивах, за счет наличия по-умолчанию утилиты pkexec с суидным битом.

Бага с первого коммита аж в мае 2009 года, и ресерчеры Qalys заявляют, что хоть это и повреждение памяти, но эксплуатация уязвимости быстра, надежна, и независима от архитектуры.

Обнаружилось, что при обработке переменной PATH специального вида существуют условия перезаписи за пределы границ envp[0], что дает возможность внедрить какбэ свою особенную LD_PRELOAD прям в суидник.
Просто до жути.

Это и делает CVE-2021-4034 весьма реальной угрозой, связанной с повышением привилегий в Linux.

🧟‍ Эксплоит уже в комментариях.

Быстрый фикс:
🔥chmod 0755 /usr/bin/pkexec
Исправление:
https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683

Подробно:
👉 https://www.openwall.com/lists/oss-security/2022/01/25/11

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🔥chmod 0755 /usr/bin/pkexec

Исправление:
https://gitlab.freedesktop.org/polkit/polkit/-/commit/a2bf5c9c83b6ae46cbd5c779d3055bff81ded683

Подробно:
👉 https://www.openwall.com/lists/oss-security/2022/01/25/11

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Telegram auto-delete message, expiring invites, and more

elegram is updating its messaging app with options for auto-deleting messages, expiring invite links, and new unlimited groups, the company shared in a blog post. Much like Signal, Telegram received a burst of new users in the confusion over WhatsApp’s privacy policy and now the company is adopting features that were already part of its competitors’ apps, features which offer more security and privacy. Auto-deleting messages were already possible in Telegram’s encrypted Secret Chats, but this new update for iOS and Android adds the option to make messages disappear in any kind of chat. Auto-delete can be enabled inside of chats, and set to delete either 24 hours or seven days after messages are sent. Auto-delete won’t remove every message though; if a message was sent before the feature was turned on, it’ll stick around. Telegram’s competitors have had similar features: WhatsApp introduced a feature in 2020 and Signal has had disappearing messages since at least 2016.

⭕️ CVE-2021-4034: pwnkit: Local Privilege Escalation in polkit's pkexec

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