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VMware Photon OS: CVE-2021-47191

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VMware Photon OS: CVE-2021-47191

Severity
6
CVSS
(AV:L/AC:L/Au:S/C:C/I:N/A:C)
Published
04/10/2024
Created
01/21/2025
Added
01/20/2025
Modified
02/04/2025

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: scsi_debug: Fix out-of-bound read in resp_readcap16() The following warning was observed running syzkaller: [ 3813.830724] sg_write: data in/out 65466/242 bytes for SCSI command 0x9e-- guessing data in; [ 3813.830724]program syz-executor not setting count and/or reply_len properly [ 3813.836956] ================================================================== [ 3813.839465] BUG: KASAN: stack-out-of-bounds in sg_copy_buffer+0x157/0x1e0 [ 3813.841773] Read of size 4096 at addr ffff8883cf80f540 by task syz-executor/1549 [ 3813.846612] Call Trace: [ 3813.846995]dump_stack+0x108/0x15f [ 3813.847524]print_address_description+0xa5/0x372 [ 3813.848243]kasan_report.cold+0x236/0x2a8 [ 3813.849439]check_memory_region+0x240/0x270 [ 3813.850094]memcpy+0x30/0x80 [ 3813.850553]sg_copy_buffer+0x157/0x1e0 [ 3813.853032]sg_copy_from_buffer+0x13/0x20 [ 3813.853660]fill_from_dev_buffer+0x135/0x370 [ 3813.854329]resp_readcap16+0x1ac/0x280 [ 3813.856917]schedule_resp+0x41f/0x1630 [ 3813.858203]scsi_debug_queuecommand+0xb32/0x17e0 [ 3813.862699]scsi_dispatch_cmd+0x330/0x950 [ 3813.863329]scsi_request_fn+0xd8e/0x1710 [ 3813.863946]__blk_run_queue+0x10b/0x230 [ 3813.864544]blk_execute_rq_nowait+0x1d8/0x400 [ 3813.865220]sg_common_write.isra.0+0xe61/0x2420 [ 3813.871637]sg_write+0x6c8/0xef0 [ 3813.878853]__vfs_write+0xe4/0x800 [ 3813.883487]vfs_write+0x17b/0x530 [ 3813.884008]ksys_write+0x103/0x270 [ 3813.886268]__x64_sys_write+0x77/0xc0 [ 3813.886841]do_syscall_64+0x106/0x360 [ 3813.887415]entry_SYSCALL_64_after_hwframe+0x44/0xa9 This issue can be reproduced with the following syzkaller log: r0 = openat(0xffffffffffffff9c, &(0x7f0000000040)='./file0\x00', 0x26e1, 0x0) r1 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000000)='fd/3\x00') open_by_handle_at(r1, &(0x7f00000003c0)=ANY=[@ANYRESHEX], 0x602000) r2 = syz_open_dev$sg(&(0x7f0000000000), 0x0, 0x40782) write$binfmt_aout(r2, &(0x7f0000000340)=ANY=[@ANYBLOB="00000000deff000000000000000000000000000000000000000000000000000047f007af9e107a41ec395f1bded7be24277a1501ff6196a83366f4e6362bc0ff2b247f68a972989b094b2da4fb3607fcf611a22dd04310d28c75039d"], 0x126) In resp_readcap16() we get "int alloc_len" value -1104926854, and then pass the huge arr_len to fill_from_dev_buffer(), but arr is only 32 bytes. This leads to OOB in sg_copy_buffer(). To solve this issue, define alloc_len as u32.

Solution(s)

  • vmware-photon_os_update_tdnf

References

  • https://attackerkb.com/topics/cve-2021-47191
  • CVE - 2021-47191
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