Detections
Analytics
Arista Networks EOS Linux Kernel TCP Multiple DoS (SA0041)
high Nessus Plugin ID 134303
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Synopsis
The version of Arista Networks EOS running on the remote device is affected by multiple denial of service (DoS) vulnerabilities.Description
The version of Arista Networks EOS 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.
Solution
Upgrade to Arista Networks EOS version 4.22.1F, 4.21.7M, 4.20.14M, 4.19.13M, 4.18.12M or later or 4.21.2.3F or 4.21.6.1.1F, or apply the patch from the vendor advisory.See Also
Plugin Details
Severity: High
ID: 134303
File Name: arista_eos_sa0041.nasl
Version: 1.7
Type: combined
Family: Misc.
Published: 3/6/2020
Updated: 3/25/2024
Configuration: Enable paranoid mode
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2019-11477
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: CVSS:3.0/E:U/RL:O/RC:C
CVSS Score Source: CVE-2019-11479
Vulnerability Information
CPE: cpe:/o:arista:eos
Required KB Items: Host/Arista-EOS/Version, Settings/ParanoidReport
Exploit Ease: No known exploits are available
Patch Publication Date: 6/26/2019
Vulnerability Publication Date: 6/18/2019