| 标题 | micropython micropython v1.21.0 to v1.22.0-preview use after free |
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| 描述 | 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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| 来源 | ⚠️ https://github.com/micropython/micropython/issues/12887 |
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| 用户 | qbit (UID 60633) |
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| 提交 | 2023-12-28 08時44分 (3 年前) |
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| 管理 | 2023-12-28 11時30分 (3 hours later) |
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| 状态 | 已接受 |
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| VulDB条目 | 249158 [MicroPython 1.21.0/1.22.0-preview extmod/modselect.c poll_set_add_fd 内存损坏] |
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| 积分 | 20 |
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