Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read/write from unvalidated DataOffset in coalesce_t2() coalesce_t2() computes data pointers directly from server-supplied DataOffset fields with no validation against buffer bounds: data_area_of_tgt = (char *)&pSMBt->hdr.Protocol + get_unaligned_le16(&pSMBt->t2_rsp.DataOffset); data_area_of_src = (char *)&pSMBs->hdr.Protocol + get_unaligned_le16(&pSMBs->t2_rsp.DataOffset); data_area_of_tgt += total_in_tgt; ... memcpy(data_area_of_tgt, data_area_of_src, total_in_src); A small DataOffset can push a pointer below the actual byte area, overwriting header fields; a large one can push it past the buffer end, causing out-of-bounds heap reads (source) or writes (target). The BCC overflow guard does not prevent this: BCC reflects how much data is present, while DataOffset controls where in the buffer it starts. The "validate target area" comment present since the function was first written in 2005 was a placeholder that was never implemented. Add lower- and upper-bound checks for both data pointers before the memcpy, and before any target header fields are modified.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e4eb295d38b57f4d4b956942a48887eb252d97c6 before 6eb70b78e48b0031bd1a05fe1b58959a48e87739; affected e4eb295d38b57f4d4b956942a48887eb252d97c6 before 36d01415d881d5326a0dd3384f781cd7e69aff2d; affected e4eb295d38b57f4d4b956942a48887eb252d97c6 before 672cf86aa6aa0fb4012ce4c3b3498df42ad67a4e; affected e4eb295d38b57f4d4b956942a48887eb252d97c6 before 033bc80019f07d158630df4e69b19a49010f54f1; affected e4eb295d38b57f4d4b956942a48887eb252d97c6 before 6343c1da561962688f203362d80d6a3bfa39fa1b |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6eb70b78e48b0031bd1a05fe1b58959a48e87739
- https://git.kernel.org/stable/c/36d01415d881d5326a0dd3384f781cd7e69aff2d
- https://git.kernel.org/stable/c/672cf86aa6aa0fb4012ce4c3b3498df42ad67a4e
- https://git.kernel.org/stable/c/033bc80019f07d158630df4e69b19a49010f54f1
- https://git.kernel.org/stable/c/6343c1da561962688f203362d80d6a3bfa39fa1b