Linux Kernel TCP Sequence Number Generation Security Weakness
medium Nessus Plugin ID 56283
Language:
Synopsis
It may be possible to predict TCP/IP Initial Sequence Numbers for the remote host.Description
The Linux kernel is prone to a security weakness related to TCP sequence number generation. Attackers can exploit this issue to inject arbitrary packets into TCP sessions using a brute-force attack.An attacker may use this vulnerability to create a denial of service condition or a man-in-the-middle attack.
Note that this plugin may fire as a result of a network device (such as a load balancer, VPN, IPS, transparent proxy, etc.) that is vulnerable and that re-writes TCP sequence numbers, rather than the host itself being vulnerable.
Solution
Contact the OS vendor for a Linux kernel update / patch.See Also
Plugin Details
Severity: Medium
ID: 56283
File Name: linux_isn.nasl
Version: 1.17
Type: remote
Family: General
Published: 9/23/2011
Updated: 3/6/2019
Configuration: Enable paranoid mode
Risk Information
VPR
Risk Factor: Medium
Score: 5.2
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Temporal Vector: E:U/RL:OF/RC:C
Vulnerability Information
Required KB Items: Settings/ParanoidReport
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 8/23/2011
Reference Information
CVE: CVE-2011-3188
BID: 49289