| शीर्षक | micropython micropython v1.21.0 to v1.22.0-preview use after free |
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| विवरण | The problem is from allocating fd for a poll object (poll_obj_t), at poll_set_add_fd because it frees previously allocated fds at m_renew.
It reallocates the whole array poll_set->pollfds by m_renew. it causes all accesses to objects after m_renew as use-after-free, and we observed some fd is overlapped with a poll object; it will lead to unintended behavior and chunk-overlapping, which can be used as a vulnerability by attackers in a way they try to malformed an object or fd by using each other.
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| स्रोत | ⚠️ https://github.com/micropython/micropython/issues/12887 |
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| उपयोगकर्ता | qbit (UID 60633) |
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| सबमिशन | 28/12/2023 08:44 AM (3 साल पहले) |
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| संयम | 28/12/2023 11:30 AM (3 hours later) |
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| स्थिति | स्वीकृत |
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| VulDB प्रविष्टि | 249158 [MicroPython 1.21.0/1.22.0-preview extmod/modselect.c poll_set_add_fd बफ़र ओवरफ़्लो] |
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| अंक | 20 |
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