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redhatcveRedhat.comRH:CVE-2023-39189
HistoryOct 09, 2023 - 8:24 a.m.

CVE-2023-39189

2023-10-0908:24:46
redhat.com
access.redhat.com
34
netfilter
linux kernel
user mode controlled
opt_num field
privileged attacker
out-of-bounds read
crash
information disclosure
passive os fingerprinting
xt_osf
mitigation
kernel module.

6 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

0.0004 Low

EPSS

Percentile

5.2%

A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did not validate the user mode controlled opt_num 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.

Mitigation

This flaw can be mitigated by preventing the affected Passive OS Fingerprinting match module (xt_osf) from being loaded. For instructions on how to blacklist a kernel module, please see <https://access.redhat.com/solutions/41278&gt;.

6 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

0.0004 Low

EPSS

Percentile

5.2%