SB2020012708 - Multiple vulnerabilities in Cisco AsyncOS Software for Cisco Email Security Appliance

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Main Vulnerability Database SB2020012708

SB2020012708 - Multiple vulnerabilities in Cisco AsyncOS Software for Cisco Email Security Appliance

Published: January 27, 2020

Security Bulletin ID SB2020012708
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 67% Low 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Input validation error (CVE-ID: CVE-2020-3134)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper validation of zip files in the zip decompression engine. A remote attacker can send an email message with a crafted zip-compressed attachment and trigger a restart of the content-scanning process, causing a temporary denial of service condition.


2) Input validation error (CVE-ID: CVE-2020-3133)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to bypass configured filters on the target device.

The vulnerability exists due to improper validation of incoming emails. A remote attacker can send a specially crafted email message to a recipient protected by the ESA and bypass the configured content filters, which could allow malicious content to pass through the device.


3) Cross-site scripting (CVE-ID: CVE-2020-3137)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear


The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the web-based management interface. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


Remediation

Install update from vendor's website.

References