CVE-2023-52568
Intel SGX Linux Kernel SECS EPC Page Reclaim Race Condition Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: x86/sgx: Resolves SECS reclaim vs. page fault for EAUG race The SGX EPC reclaimer (ksgxd) may reclaim the SECS EPC page for an enclave and set secs.epc_page to NULL. The SECS page is used for EAUG and ELDU in the SGX page fault handler. However, the NULL check for secs.epc_page is only done for ELDU, not EAUG before being used. Fix this by doing the same NULL check and reloading of the SECS page as needed for both EAUG and ELDU. The SECS page holds global enclave metadata. It can only be reclaimed when there are no other enclave pages remaining. At that point, virtually nothing can be done with the enclave until the SECS page is paged back in. An enclave can not run nor generate page faults without a resident SECS page. But it is still possible for a #PF for a non-SECS page to race with paging out the SECS page: when the last resident non-SECS page A triggers a #PF in a non-resident page B, and then page A and the SECS both are paged out before the #PF on B is handled. Hitting this bug requires that race triggered with a #PF for EAUG. Following is a trace when it happens. BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:sgx_encl_eaug_page+0xc7/0x210 Call Trace: ? __kmem_cache_alloc_node+0x16a/0x440 ? xa_load+0x6e/0xa0 sgx_vma_fault+0x119/0x230 __do_fault+0x36/0x140 do_fault+0x12f/0x400 __handle_mm_fault+0x728/0x1110 handle_mm_fault+0x105/0x310 do_user_addr_fault+0x1ee/0x750 ? __this_cpu_preempt_check+0x13/0x20 exc_page_fault+0x76/0x180 asm_exc_page_fault+0x27/0x30
INFO
Published Date :
March 2, 2024, 10:15 p.m.
Last Modified :
Dec. 11, 2024, 4:23 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.0
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-52568.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-52568 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-52568 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Dec. 11, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.0 up to (excluding) 6.1.56 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.5.6 *cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/1348f7f15d7c7798456856bee74a4235c2da994e No Types Assigned https://git.kernel.org/stable/c/1348f7f15d7c7798456856bee74a4235c2da994e Patch Changed Reference Type https://git.kernel.org/stable/c/1348f7f15d7c7798456856bee74a4235c2da994e No Types Assigned https://git.kernel.org/stable/c/1348f7f15d7c7798456856bee74a4235c2da994e Patch Changed Reference Type https://git.kernel.org/stable/c/811ba2ef0cb6402672e64ba1419d6ef95aa3405d No Types Assigned https://git.kernel.org/stable/c/811ba2ef0cb6402672e64ba1419d6ef95aa3405d Patch Changed Reference Type https://git.kernel.org/stable/c/811ba2ef0cb6402672e64ba1419d6ef95aa3405d No Types Assigned https://git.kernel.org/stable/c/811ba2ef0cb6402672e64ba1419d6ef95aa3405d Patch Changed Reference Type https://git.kernel.org/stable/c/c6c2adcba50c2622ed25ba5d5e7f05f584711358 No Types Assigned https://git.kernel.org/stable/c/c6c2adcba50c2622ed25ba5d5e7f05f584711358 Patch Changed Reference Type https://git.kernel.org/stable/c/c6c2adcba50c2622ed25ba5d5e7f05f584711358 No Types Assigned https://git.kernel.org/stable/c/c6c2adcba50c2622ed25ba5d5e7f05f584711358 Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/1348f7f15d7c7798456856bee74a4235c2da994e Added Reference https://git.kernel.org/stable/c/811ba2ef0cb6402672e64ba1419d6ef95aa3405d Added Reference https://git.kernel.org/stable/c/c6c2adcba50c2622ed25ba5d5e7f05f584711358 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 02, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: x86/sgx: Resolves SECS reclaim vs. page fault for EAUG race The SGX EPC reclaimer (ksgxd) may reclaim the SECS EPC page for an enclave and set secs.epc_page to NULL. The SECS page is used for EAUG and ELDU in the SGX page fault handler. However, the NULL check for secs.epc_page is only done for ELDU, not EAUG before being used. Fix this by doing the same NULL check and reloading of the SECS page as needed for both EAUG and ELDU. The SECS page holds global enclave metadata. It can only be reclaimed when there are no other enclave pages remaining. At that point, virtually nothing can be done with the enclave until the SECS page is paged back in. An enclave can not run nor generate page faults without a resident SECS page. But it is still possible for a #PF for a non-SECS page to race with paging out the SECS page: when the last resident non-SECS page A triggers a #PF in a non-resident page B, and then page A and the SECS both are paged out before the #PF on B is handled. Hitting this bug requires that race triggered with a #PF for EAUG. Following is a trace when it happens. BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:sgx_encl_eaug_page+0xc7/0x210 Call Trace: ? __kmem_cache_alloc_node+0x16a/0x440 ? xa_load+0x6e/0xa0 sgx_vma_fault+0x119/0x230 __do_fault+0x36/0x140 do_fault+0x12f/0x400 __handle_mm_fault+0x728/0x1110 handle_mm_fault+0x105/0x310 do_user_addr_fault+0x1ee/0x750 ? __this_cpu_preempt_check+0x13/0x20 exc_page_fault+0x76/0x180 asm_exc_page_fault+0x27/0x30 Added Reference Linux https://git.kernel.org/stable/c/811ba2ef0cb6402672e64ba1419d6ef95aa3405d [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/1348f7f15d7c7798456856bee74a4235c2da994e [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/c6c2adcba50c2622ed25ba5d5e7f05f584711358 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-52568 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-52568
weaknesses.