Arista Networks CloudVision Portal Linux Kernel TCP Multiple DoS (SA0041)
high Nessus Plugin ID 138345
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Synopsis
The version of Arista Networks CloudVision Portal running on the remote device is affected by multiple denial of service (DoS) vulnerabilities.Description
The version of Arista Networks CloudVision Portal running on the remote device is affected by the following denial of service (DoS) vulnerabilities related to TCP networking in the Linux kernel, which can be exploited by a remote, unauthenticated attacker:- SACK Panic. The TCP_SKB_CB(skb)->tcp_gso_segs value is subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). (CVE-2019-11477)
- SACK Slowness. The TCP retransmission queue implementation in tcp_fragment in the Linux kernel can be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. (CVE-2019-11478)
- The Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. (CVE-2019-11479)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number. To retrieve version information this plugin requires the HTTP credentials of the web console.
Solution
Apply the mitigation or upgrade to a fixed version as referenced in the vendor advisory.See Also
Plugin Details
Severity: High
ID: 138345
File Name: arista_cvp_sa0041.nasl
Version: 1.2
Type: combined
Family: Misc.
Published: 7/9/2020
Updated: 7/10/2020
Dependencies: arista_cloudvision_portal_detect.nbin
Configuration: Enable paranoid mode
Risk Information
CVSS Score Source: CVE-2019-11477
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Temporal Vector: E:U/RL:OF/RC:C
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:arista:cloudvision_portal
Required KB Items: installed_sw/Arista CloudVision Portal, Settings/ParanoidReport
Exploit Ease: No known exploits are available
Patch Publication Date: 6/26/2019
Vulnerability Publication Date: 6/18/2019