CVE-2023-6610: Kernel: oob access in smb2_dump_detail
First published: Fri Dec 08 2023(Updated: )
An Out-Of-Bounds Read vulnerability in smb2_dump_detail in fs/smb/client/smb2ops.c in the Linux Kernel. This flaw could allow a local attacker to crash the system or leak internal kernel information. Refer: <a href="https://bugzilla.kernel.org/show_bug.cgi?id=218219">https://bugzilla.kernel.org/show_bug.cgi?id=218219</a> 1] If CONFIG_CIFS_DEBUG2 is set, then cifs_demultiplex_thread calls dump_detail. ``` static int cifs_demultiplex_thread(void *p) { ... for (i = 0; i < num_mids; i++) { if (mids[i] != NULL) { mids[i]->resp_buf_size = server->pdu_size; if (bufs[i] != NULL) { if (server->ops->is_network_name_deleted && server->ops->is_network_name_deleted(bufs[i], server)) { cifs_server_dbg(FYI, "Share deleted. Reconnect needed"); } } if (!mids[i]->multiRsp || mids[i]->multiEnd) mids[i]->callback(mids[i]); release_mid(mids[i]); } else if (server->ops->is_oplock_break && server->ops->is_oplock_break(bufs[i], server)) { smb2_add_credits_from_hdr(bufs[i], server); cifs_dbg(FYI, "Received oplock break\n"); } else { cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n", atomic_read(&mid_count)); cifs_dump_mem("Received Data is: ", bufs[i], HEADER_SIZE(server)); smb2_add_credits_from_hdr(bufs[i], server); #ifdef CONFIG_CIFS_DEBUG2 if (server->ops->dump_detail) server->ops->dump_detail(bufs[i], server);//[1] cifs_dump_mids(server); #endif /* CIFS_DEBUG2 */ } } ``` //[2]In smb2_dump_detail, calc_smb_size is called, which refers to smb2_calc_size. ``` static void smb2_dump_detail(void *buf, struct TCP_Server_Info *server) { #ifdef CONFIG_CIFS_DEBUG2 struct smb2_hdr *shdr = (struct smb2_hdr *)buf; cifs_server_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n", shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId, shdr->Id.SyncId.ProcessId); cifs_server_dbg(VFS, "smb buf %p len %u\n", buf, server->ops->calc_smb_size(buf));//[2] #endif } ``` In has_smb2_data_area, it attempts to retrieve an element at the index le16_to_cpu(shdr->Command). If a value larger than the length of has_smb2_data_area is input, an OOB (Out-Of-Bounds) Read occurs." ``` unsigned int smb2_calc_size(void *buf) { struct smb2_pdu *pdu = buf; struct smb2_hdr *shdr = &pdu->hdr; int offset; /* the offset from the beginning of SMB to data area */ int data_length; /* the length of the variable length data area */ /* Structure Size has already been checked to make sure it is 64 */ int len = le16_to_cpu(shdr->StructureSize); /* * StructureSize2, ie length of fixed parameter area has already * been checked to make sure it is the correct length. */ len += le16_to_cpu(pdu->StructureSize2); if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)//[3] goto calc_size_exit; ```
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| IBM QRadar SIEM | <=7.5 - 7.5.0 UP8 IF01 | |
| Linux Linux kernel | ||
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2253614
- https://access.redhat.com/security/cve/CVE-2023-6610
- https://bugzilla.kernel.org/show_bug.cgi?id=218219
- https://access.redhat.com/errata/RHSA-2024:0723
- https://access.redhat.com/errata/RHSA-2024:0724
- https://access.redhat.com/errata/RHSA-2024:0725
- https://access.redhat.com/errata/RHSA-2024:0881
- https://access.redhat.com/errata/RHSA-2024:0897
- https://access.redhat.com/errata/RHSA-2024:1248
- https://access.redhat.com/errata/RHSA-2024:1404
- https://launchpad.net/bugs/cve/CVE-2023-6610
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2254059
- https://exchange.xforce.ibmcloud.com/vulnerabilities/273676
- https://www.ibm.com/support/pages/node/7150684 (Advisory)
- https://access.redhat.com/errata/RHSA-2024:2094
- https://git.kernel.org/linus/567320c46a60a3c39b69aa1df802d753817a3f86
- https://security-tracker.debian.org/tracker/CVE-2023-6610
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6610
- https://nvd.nist.gov/vuln/detail/CVE-2023-6610
- https://ubuntu.com/security/CVE-2023-6610
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2023-6610.
What is the title of this vulnerability?
The title of this vulnerability is 'Kernel: oob access in smb2_dump_detail'.
Where can I find more information about this vulnerability?
You can find more information about this vulnerability at the following references: [Reference 1](https://access.redhat.com/security/cve/CVE-2023-6610), [Reference 2](https://bugzilla.kernel.org/show_bug.cgi?id=218219), [Reference 3](https://bugzilla.redhat.com/show_bug.cgi?id=2253614).
What is the severity of CVE-2023-6610?
The severity of CVE-2023-6610 is high with a CVSS score of 7.1.
How can I fix the oob access vulnerability in smb2_dump_detail?
To fix the oob access vulnerability in smb2_dump_detail, it is recommended to apply the latest security updates or patches provided by the Linux Kernel maintainers.
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