smb: client: fix OOB read/write from unvalidated DataOffset in coalesce_t2()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.113, 6.18.51, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From e4eb295d38b57f4d4b956942a48887eb252d97c6 · fixed in 6eb70b78e48b0031bd1a05fe1b58959a48e87739; From e4eb295d38b57f4d4b956942a48887eb252d97c6 · fixed in 36d01415d881d5326a0dd3384f781cd7e69aff2d; From e4eb295d38b57f4d4b956942a48887eb252d97c6 · fixed in 672cf86aa6aa0fb4012ce4c3b3498df42ad67a4e; From e4eb295d38b57f4d4b956942a48887eb252d97c6 · fixed in 033bc80019f07d158630df4e69b19a49010f54f1; From e4eb295d38b57f4d4b956942a48887eb252d97c6 · fixed in 6343c1da561962688f203362d80d6a3bfa39fa1b
- Linux Linux
2.6.12
- KernelLinux
From 2.6.12 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.4