CVE-2023-39193

Kernel: netfilter: xtables sctp out-of-bounds read in match_flags()

Description

A flaw was found in the Netfilter subsystem in the Linux kernel. The sctp_mt_check did not validate the flag_count field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.

Remediation

Workaround:

  • This flaw can be mitigated by preventing the affected `xt_sctp` kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.01%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 9
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2024:2394 vendor advisory
https://access.redhat.com/errata/RHSA-2024:2950 vendor advisory
https://access.redhat.com/errata/RHSA-2024:3138 vendor advisory
https://access.redhat.com/security/cve/CVE-2023-39193 third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2226787 third party advisory issue tracking patch
https://www.zerodayinitiative.com/advisories/ZDI-CAN-18866/ vdb entry third party advisory patch
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html

Frequently Asked Questions

What is the severity of CVE-2023-39193?
CVE-2023-39193 has been scored as a medium severity vulnerability.
How to fix CVE-2023-39193?
As a workaround for remediating CVE-2023-39193: This flaw can be mitigated by preventing the affected `xt_sctp` kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.
Is CVE-2023-39193 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-39193 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-39193?
CVE-2023-39193 affects Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 9.
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