high
7.4
CWE
330
Advisory Published
CVE Published
CVE Published
Updated

CVE-2020-25705

First published: Wed Nov 04 2020(Updated: )

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Based Products (RUGGEDCOM RM1224: All versions between v5.0 and v6.4, SCALANCE M-800: All versions between v5.0 and v6.4, SCALANCE S615: All versions between v5.0 and v6.4, SCALANCE SC-600: All versions prior to v2.1.3, SCALANCE W1750D: v8.3.0.1, v8.6.0, and v8.7.0, SIMATIC Cloud Connect 7: All versions, SIMATIC MV500 Family: All versions, SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later, SIMATIC NET CP 1243-7 LTE EU: Version

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:3.10.0-1160.21.1.rt56.1158.el7
0:3.10.0-1160.21.1.rt56.1158.el7
redhat/kernel<0:3.10.0-1160.21.1.el7
0:3.10.0-1160.21.1.el7
redhat/kernel<0:3.10.0-693.87.1.el7
0:3.10.0-693.87.1.el7
redhat/kernel<0:3.10.0-957.76.1.el7
0:3.10.0-957.76.1.el7
redhat/kernel<0:3.10.0-1062.49.1.el7
0:3.10.0-1062.49.1.el7
redhat/kernel-rt<0:4.18.0-240.15.1.rt7.69.el8_3
0:4.18.0-240.15.1.rt7.69.el8_3
redhat/kernel<0:4.18.0-240.15.1.el8_3
0:4.18.0-240.15.1.el8_3
redhat/kernel<0:4.18.0-147.43.1.el8_1
0:4.18.0-147.43.1.el8_1
redhat/kernel-rt<0:4.18.0-193.46.1.rt13.96.el8_2
0:4.18.0-193.46.1.rt13.96.el8_2
redhat/kernel<0:4.18.0-193.46.1.el8_2
0:4.18.0-193.46.1.el8_2
Linux Linux kernel<5.10.0
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux=8.0
Siemens RUGGEDCOM RM1224>=5.0<=6.4
Siemens SCALANCE M-800>=5.0<=6.4
Siemens SCALANCE S615>=5.0<=6.4
Siemens SCALANCE SC-600<2.1.3
2.1.3
Siemens SCALANCE W1750D=8.3.0.1=8.6.0=8.7.0
Siemens SIMATIC MV500 Family
Siemens SIMATIC CP 1243-7 LTE EU>=3.1.39<3.3
3.3
Siemens SIMATIC CP 1243-7 LTE US>=3.1.39<3.3
3.3
Siemens SIMATIC CP 1242-7 GPRS V2>=3.1.39<3.3
3.3
Siemens SIMATIC CP 1542SP-1 IRC (incl. SIPLUS variants)>=2.0
Siemens SIMATIC CP 1542SP-1>=2.0
Siemens SIMATIC CP 1543-1 (incl. SIPLUS variants)<3.0
3.0
Siemens SIMATIC CP 1543SP-1 (incl SIPLUS variants)>=2.0
Siemens SIMATIC CP 1545-1<1.1
1.1
redhat/kernel<5.10
5.10
Google Android
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.11.10-1
6.12.5-1

Remedy

The mitigation is to disable ICMP destination unreachable messages. The commands to disable UDP port unreachable ICMP reply messages: iptables -I OUTPUT -p icmp --icmp-type destination-unreachable -j DROP service iptables save For additional information about "service iptables save" please read https://access.redhat.com/solutions/1597703 It is not recommended to apply this rule if host being used as forwarder (router) of IP packets. Or it is possible to use this firewall-cmd instead of iptables and the result is similar: firewall-cmd --permanent --direct --add-rule ipv4 filter OUTPUT 0 -p icmp --icmp-type destination-unreachable -j DROP

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