CVE-2023-52767
Linux Kernel TLS NULL Dereference Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: tls: fix NULL deref on tls_sw_splice_eof() with empty record syzkaller discovered that if tls_sw_splice_eof() is executed as part of sendfile() when the plaintext/ciphertext sk_msg are empty, the send path gets confused because the empty ciphertext buffer does not have enough space for the encryption overhead. This causes tls_push_record() to go on the `split = true` path (which is only supposed to be used when interacting with an attached BPF program), and then get further confused and hit the tls_merge_open_record() path, which then assumes that there must be at least one populated buffer element, leading to a NULL deref. It is possible to have empty plaintext/ciphertext buffers if we previously bailed from tls_sw_sendmsg_locked() via the tls_trim_both_msgs() path. tls_sw_push_pending_record() already handles this case correctly; let's do the same check in tls_sw_splice_eof().
INFO
Published Date :
May 21, 2024, 4:15 p.m.
Last Modified :
Jan. 6, 2025, 8:29 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
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-2023-52767.
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-2023-52767 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-52767 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]
Jan. 06, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/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) 6.5 up to (excluding) 6.6.4 *cpe:2.3:o:linux:linux_kernel:6.7:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.7:rc2:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/2214e2bb5489145aba944874d0ee1652a0a63dc8 No Types Assigned https://git.kernel.org/stable/c/2214e2bb5489145aba944874d0ee1652a0a63dc8 Patch Changed Reference Type https://git.kernel.org/stable/c/2214e2bb5489145aba944874d0ee1652a0a63dc8 No Types Assigned https://git.kernel.org/stable/c/2214e2bb5489145aba944874d0ee1652a0a63dc8 Patch Changed Reference Type https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0 No Types Assigned https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0 Patch Changed Reference Type https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0 No Types Assigned https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0 Patch Changed Reference Type https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9 No Types Assigned https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9 Patch Changed Reference Type https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9 No Types Assigned https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9 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/2214e2bb5489145aba944874d0ee1652a0a63dc8 Added Reference https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0 Added Reference https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 29, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: tls: fix NULL deref on tls_sw_splice_eof() with empty record syzkaller discovered that if tls_sw_splice_eof() is executed as part of sendfile() when the plaintext/ciphertext sk_msg are empty, the send path gets confused because the empty ciphertext buffer does not have enough space for the encryption overhead. This causes tls_push_record() to go on the `split = true` path (which is only supposed to be used when interacting with an attached BPF program), and then get further confused and hit the tls_merge_open_record() path, which then assumes that there must be at least one populated buffer element, leading to a NULL deref. It is possible to have empty plaintext/ciphertext buffers if we previously bailed from tls_sw_sendmsg_locked() via the tls_trim_both_msgs() path. tls_sw_push_pending_record() already handles this case correctly; let's do the same check in tls_sw_splice_eof(). Added Reference kernel.org https://git.kernel.org/stable/c/944900fe2736c07288efe2d9394db4d3ca23f2c9 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/2214e2bb5489145aba944874d0ee1652a0a63dc8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/53f2cb491b500897a619ff6abd72f565933760f0 [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-2023-52767 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-2023-52767
weaknesses.