Detections
Analytics

Cisco Adaptive Security Appliance Software DoS (cisco-sa-20181003-asa-syslog-dos)

medium Nessus Plugin ID 127893

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, the TCP syslog module of Cisco Adaptive Security Appliance (ASA) Software and allows an unauthenticated, remote attacker to exhaust the 1550-byte buffers on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing boundary check in an internal function. An attacker can exploit this vulnerability by establishing a man-in-the-middle position between an affected device and its configured TCP syslog server and then maliciously modifying the TCP header in segments that are sent from the syslog server to the affected device. A successful exploit could allow the attacker to exhaust buffer on the affected device and cause all TCP-based features to stop functioning, resulting in a DoS condition. The affected TCP-based features include AnyConnect SSL VPN, clientless SSL VPN, and management connections such as Secure Shell (SSH), Telnet, and HTTPS.

Please see the included Cisco BIDs and Cisco Security Advisory for more information

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvh73829

See Also

http://www.nessus.org/u?6fd359b3

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvh73829

Plugin Details

Severity: Medium

ID: 127893

File Name: cisco-sa-20181003-asa-syslog-dos.nasl

Version: 1.7

Type: local

Family: CISCO

Published: 8/14/2019

Updated: 3/31/2023

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2018-15399

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:adaptive_security_appliance_software

Required KB Items: Host/Cisco/ASA, Host/Cisco/ASA/model, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 10/3/2018

Vulnerability Publication Date: 10/3/2018

Reference Information

CVE: CVE-2018-15399

CWE: 332

CISCO-SA: cisco-sa-20181003-asa-syslog-dos

IAVA: 2019-A-0271-S

CISCO-BUG-ID: CSCvh73829