ICSA-21-042-01: Multiple Embedded TCP/IP Stacks (Update B)
Nut/Net software relies on highly predictable source values and has consistent increments when generating initial sequence numbers (ISN), which may allow an attacker to spoof or disrupt TCP connections.CVE-2020-27213 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). uC/TCP-IP ISN generation relies on a linear congruential generator (LCG), which is reversable from observed output streams as the algorithm is seeded with publicly recoverable information. This defect may allow an attacker to spoof or disrupt TCP connections.CVE-2020-27630 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). CycloneTCP ISN generation relies on a linear congruential generator (LCG), which is reversable from observed output streams as the algorithm is seeded with publicly recoverable information. This defect may allow an attacker to spoof or disrupt TCP connections.CVE-2020-27631 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). NDKTCPIP software is initialized with a consistent value and has consistent increments when generating initial sequence numbers (ISN), which may allow an attacker to spoof or disrupt TCP connections.CVE-2020-27632 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). FNET software is initialized with a consistent value and has consistent increments when generating initial sequence numbers (ISN), which may allow an attacker to spoof or disrupt TCP connections.CVE-2020-27633 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). uIP, Contiki-OS, and Contiki-NG software is initialized with a consistent value and has consistent increments when generating initial sequence numbers (ISN), which may allow an attacker to spoof or disrupt TCP connections.CVE-2020-27634 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). PicoTCP PicoTCP-NG software ISN generation relies on a linear congruential generator (LCG), which is reversable from observed output streams as the algorithm is seeded with publicly recoverable information. This defect may allow an attacker to spoof or disrupt TCP connections.CVE-2020-27635 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). MPLAB software ISN generation relies on a linear congruential generator (LCG), which is reversable from observed output streams as the algorithm is seeded with publicly recoverable information. This defect may allow an attacker to spoof or disrupt TCP connections.CVE-2020-27636 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N). Nucleus NET and Nucleus ReadyStart software ISN generation relies on a combination of values that can be acquired from capturing network traffic, which may allow an attacker to spoof or disrupt TCP connections.CVE-2020-28388 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).
CVSS v3.0: 6.5