Vulnerability Details : CVE-2023-4194
A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.
Vulnerability category: Bypass
Products affected by CVE-2023-4194
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.5:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.5:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.5:rc4:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-4194
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-4194
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
1.8
|
3.6
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
1.8
|
3.6
|
Red Hat, Inc. |
CWE ids for CVE-2023-4194
-
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Secondary)
-
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Primary)
References for CVE-2023-4194
-
https://www.debian.org/security/2023/dsa-5480
Debian -- Security Information -- DSA-5480-1 linuxThird Party Advisory
-
https://access.redhat.com/errata/RHSA-2023:6583
RHSA-2023:6583 - Security Advisory - Red Hat カスタマーポータルThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TYLSJ2SAI7RF56ZLQ5CQWCJLVJSD73Q/
[SECURITY] Fedora 38 Update: kernel-6.4.10-200.fc38 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://www.debian.org/security/2023/dsa-5492
Debian -- Security Information -- DSA-5492-1 linuxThird Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=2229498
2229498 – (CVE-2023-4194) CVE-2023-4194 kernel: tap: tap_open(): correctly initialize socket uid next fix of i_uid to current_fsuidIssue Tracking;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20231027-0002/
August 2023 Linux Kernel 6.5-rc5 Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/
[PATCH 0/2] tun/tap: set sk_uid from current_fsuid() - Laszlo ErsekMailing List;Patch;Vendor Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/344H6HO6SSC4KT7PDFXSDIXKMKHISSGF/
[SECURITY] Fedora 37 Update: kernel-6.4.10-100.fc37 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
[SECURITY] [DLA 3623-1] linux-5.10 security updateMailing List;Third Party Advisory
-
https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/
[PATCH 1/2] net: tun_chr_open(): set sk_uid from current_fsuid() - Laszlo ErsekMailing List;Patch;Vendor Advisory
-
https://access.redhat.com/security/cve/CVE-2023-4194
CVE-2023-4194- Red Hat Customer PortalThird Party Advisory
-
https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/
[PATCH 2/2] net: tap_open(): set sk_uid from current_fsuid() - Laszlo ErsekMailing List;Patch;Vendor Advisory
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