Vulnerabilities > CVE-2019-14810 - Race Condition vulnerability in Arista Extensible Operating System
Attack vector
NETWORK Attack complexity
HIGH Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
A vulnerability has been found in the implementation of the Label Distribution Protocol (LDP) protocol in EOS. Under race conditions, the LDP agent can establish an LDP session with a malicious peer potentially allowing the possibility of a Denial of Service (DoS) attack on route updates and in turn potentially leading to an Out of Memory (OOM) condition that is disruptive to traffic forwarding. Affected EOS versions include: 4.22 release train: 4.22.1F and earlier releases 4.21 release train: 4.21.0F - 4.21.2.3F, 4.21.3F - 4.21.7.1M 4.20 release train: 4.20.14M and earlier releases 4.19 release train: 4.19.12M and earlier releases End of support release trains (4.18 and 4.17)
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leveraging Race Conditions This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
- Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.
Nessus
| NASL family | Misc. |
| NASL id | ARISTA_EOS_SA0042.NASL |
| description | The version of Arista Networks EOS running on the remote device is affected by a denial of service vulnerability in the Label Distribution Protocol (LDP). An unauthenticated, remote attacker can exploit this by establishing an LDP session with the EOS device under race conditions and sending route updates in order to cause an Out of Memory (OOM) condition that is disruptive to traffic forwarding. Note that Nessus has not tested for this issue but has instead relied only on the application |
| last seen | 2020-03-17 |
| modified | 2020-03-11 |
| plugin id | 134418 |
| published | 2020-03-11 |
| reporter | This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. |
| source | https://www.tenable.com/plugins/nessus/134418 |
| title | Arista Networks EOS LDP DoS (SA0042) |
| code | |
References
- https://www.arista.com/en/support/advisories-notices
- https://www.arista.com/en/support/advisories-notices
- https://www.arista.com/en/support/advisories-notices/security-advisories/8321-security-advisory-42
- https://www.arista.com/en/support/advisories-notices/security-advisories/8321-security-advisory-42