In the Linux kernel, the following vulnerability has been resolved:
staging: rtl8723bs: fix OOB reads in rtw_get_wps_ie()
rtw_get_wps_ie() iterates over IE data from network frames without validating that the IE header and payload fit within the remaining buffer before reading them. Specifically:
- in_ie[cnt + 1] is read without checking cnt + 1 < in_len
- memcmp(&in_ie[cnt + 2], …) accesses cnt + 2 without bounds check
- in_ie[cnt + 1] is used as length without verifying payload fits
Add bounds checks at the top of the loop body to break early if fewer than 2 bytes remain for the IE header, or if the declared payload extends past the end of the buffer. Also require at least 4 bytes of payload before comparing the WPS OUI.
References
- https://git.kernel.org/stable/c/0e95ff792ae0aa6fbad9455943e9e1e4062670e9
- https://git.kernel.org/stable/c/23c31f107b4f8f420a754a45d12599bdb78f9bb8
- https://git.kernel.org/stable/c/630fdca3f2437fee3ffd437c4b646ccf84c7be87
- https://git.kernel.org/stable/c/875479f18835ac11e21a83e88f3d4dc7ccdcd0c4
- https://git.kernel.org/stable/c/b9d9a4cd2e59df7281992a076464d2536e80c674