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CCE
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CCE-95063-4

Platform: cpe:/o:debian:debian_linux:11.x, cpe:/o:ubuntu:ubuntu_linux:20.04, cpe:/o:ubuntu:ubuntu_linux:22.04, cpe:/o:ubuntu:ubuntu_linux:23.04Date: (C)2020-10-15   (M)2023-09-01



When enabled, this feature logs packets with un-routable source addresses to the kernel log. Rationale: 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 and run sysctl -p command: 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


Parameter:

[yes/no]


Technical Mechanism:

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 : 7.3Attack Vector: NETWORK
Exploit Score: 3.9Attack Complexity: LOW
Impact Score: 3.4Privileges Required: NONE
Severity: HIGHUser Interaction: NONE
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:LScope: UNCHANGED
 Confidentiality: LOW
 Integrity: LOW
 Availability: LOW
  

References:
Resource IdReference
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:85139
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:87287
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:92245
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:65932


OVAL    4
oval:org.secpod.oval:def:87287
oval:org.secpod.oval:def:65932
oval:org.secpod.oval:def:85139
oval:org.secpod.oval:def:92245
...
XCCDF    6
xccdf_org.secpod_benchmark_NIST_800_53_r5_Debain_11
xccdf_org.secpod_benchmark_general_Ubuntu_23.04
xccdf_org.secpod_benchmark_NIST_800_53_r5_Debian_11
xccdf_org.secpod_benchmark_general_Ubuntu_22.04
...

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