Description
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix WEP length underflow and OOB read in OnAuth() OnAuth() has two bugs in the shared-key authentication path. When the Privacy bit is set, rtw_wep_decrypt() is called without verifying that the frame is long enough to contain a valid WEP IV and ICV. Inside rtw_wep_decrypt(), length is computed as: length = len - WLAN_HDR_A3_LEN - iv_len and then passed as (length - 4) to crc32_le(). If len is less than WLAN_HDR_A3_LEN + iv_len + icv_len (32 bytes), length - 4 is negative and, after the implicit cast to size_t, causes crc32_le() to read far beyond the frame buffer. Add a minimum length check before accessing the IV field and calling the decryption path. When processing a seq=3 response, rtw_get_ie() stores the Challenge Text IE length in ie_len, but the subsequent memcmp() always reads 128 bytes regardless of ie_len. IEEE 802.11 mandates a challenge text of exactly 128 bytes; reject any IE whose length field differs, matching the check already applied to OnAuthClient().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
554c0a3abf216c991c5ebddcdb2c08689ecd290b to < 665e1ecb68b4e8419604e70a33f02d1c8b0222c6affected554c0a3abf216c991c5ebddcdb2c08689ecd290b to < 87cccc2a767f17dcab71e3b9fe5ae29b5516c5ceaffected554c0a3abf216c991c5ebddcdb2c08689ecd290b to < c9000c93078e5c0a5a651b077c0ec92a4bc7d580affected554c0a3abf216c991c5ebddcdb2c08689ecd290b to < 1f6c9d255bdda41216b6e34c96aa2b1abee0bb84affected554c0a3abf216c991c5ebddcdb2c08689ecd290b to < 3e44a7665f3abd320a80d9c64ee4a93317041b8baffected554c0a3abf216c991c5ebddcdb2c08689ecd290b to < 64ec4192d9c10e96922245d4a6747304cc76b19daffected554c0a3abf216c991c5ebddcdb2c08689ecd290b to < d90b9f39f375c9826ef145605dfe97765d0ecb91affected554c0a3abf216c991c5ebddcdb2c08689ecd290b to < a1fc19d61f661d47204f095b593de507884849f7affected
Linux Linux
Default version status: affected
4.12affected0 to < 4.12unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.96 to ≤ 6.12.*unaffected6.18.39 to ≤ 6.18.*unaffected7.1.4 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/665e1ecb68b4e8419604e70a33f02d1c8b0222c6 ↗
- https://git.kernel.org/stable/c/87cccc2a767f17dcab71e3b9fe5ae29b5516c5ce ↗
- https://git.kernel.org/stable/c/c9000c93078e5c0a5a651b077c0ec92a4bc7d580 ↗
- https://git.kernel.org/stable/c/1f6c9d255bdda41216b6e34c96aa2b1abee0bb84 ↗
- https://git.kernel.org/stable/c/3e44a7665f3abd320a80d9c64ee4a93317041b8b ↗
- https://git.kernel.org/stable/c/64ec4192d9c10e96922245d4a6747304cc76b19d ↗
- https://git.kernel.org/stable/c/d90b9f39f375c9826ef145605dfe97765d0ecb91 ↗
- https://git.kernel.org/stable/c/a1fc19d61f661d47204f095b593de507884849f7 ↗