Detections
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Cisco Secure Client Carriage Return Line Feed Injection (cisco-sa-secure-client-crlf-W43V4G7)

high Nessus Plugin ID 191708

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

According to its self-reported version, Cisco Secure Client, formerly AnyConnect Secure Mobility Client, is affected by a vulnerability in the SAML authentication process of Cisco Secure Client. The vulnerability could allow an unauthenticated, remote attacker to conduct a carriage return line feed (CRLF) injection attack against a user. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link while establishing a VPN session. A successful exploit could allow the attacker to execute arbitrary script code in the browser or access sensitive, browser-based information, including a valid SAML token. The attacker could then use the token to establish a remote access VPN session with the privileges of the affected user. Individual hosts and services behind the VPN headend would still need additional credentials for successful access.

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 CSCwi37512

See Also

http://www.nessus.org/u?fe1890ee

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwi37512

Plugin Details

Severity: High

ID: 191708

File Name: cisco-sa-secure-client-crlf-W43V4G7.nasl

Version: 1.1

Type: local

Agent: windows, macosx, unix

Family: CISCO

Published: 3/7/2024

Updated: 3/12/2024

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.5

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

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

CVSS Score Source: CVE-2024-20337

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.4

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

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

Vulnerability Information

CPE: cpe:/a:cisco:anyconnect_secure_mobility_client, cpe:/a:cisco:secure_client

Required KB Items: installed_sw/Cisco AnyConnect Secure Mobility Client

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/6/2024

Vulnerability Publication Date: 3/6/2024

Reference Information

CVE: CVE-2024-20337

CWE: 93

CISCO-SA: cisco-sa-secure-client-crlf-W43V4G7

IAVA: 2024-A-0139

CISCO-BUG-ID: CSCwi37512