CCE-92963-8Platform: cpe:/o:ubuntu:ubuntu_linux:19.04 | Date: (C)2019-11-07 (M)2023-07-04 |
Log Suspicious Packets
When enabled, this feature logs packets with un-routable source addresses to the kernel log.
Parameter:
[yes/no]
Technical Mechanism:
Enabling this feature and logging these packets allows an administrator to investigate the possibility that an attacker is sending spoofed packets to their server.
Fix:
Set the net.ipv4.conf.all.log_martians and net.ipv4.conf.default.log_martians parameters to
1 in /etc/sysctl.conf:
net.ipv4.conf.all.log_martians=1 net.ipv4.conf.default.log_martians=1
Modify active kernel parameters to match:
# /sbin/sysctl -w net.ipv4.conf.all.log_martians=1
# /sbin/sysctl -w net.ipv4.conf.default.log_martians=1
# /sbin/sysctl -w net.ipv4.route.flush=1
CCSS Severity: | CCSS Metrics: |
CCSS Score : 7.3 | Attack Vector: NETWORK |
Exploit Score: 3.9 | Attack Complexity: LOW |
Impact Score: 3.4 | Privileges Required: NONE |
Severity: HIGH | User Interaction: NONE |
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L | Scope: UNCHANGED |
| Confidentiality: LOW |
| Integrity: LOW |
| Availability: LOW |
| |
References: Resource Id | Reference |
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SCAP Repo OVAL Definition | oval:org.secpod.oval:def:55176 |