| Title | micropython micropython v1.21.0 to v1.22.0-preview use after free |
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| Description | 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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| Source | ⚠️ https://github.com/micropython/micropython/issues/12887 |
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| User | qbit (UID 60633) |
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| Submission | 12/28/2023 08:44 (2 years ago) |
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| Moderation | 12/28/2023 11:30 (3 hours later) |
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| Status | Accepted |
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| VulDB entry | 249158 [MicroPython 1.21.0/1.22.0-preview extmod/modselect.c poll_set_add_fd use after free] |
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| Points | 20 |
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