SB2019122201 - Denial of service in F5 Networks BIG-IP

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Main Vulnerability Database SB2019122201

SB2019122201 - Denial of service in F5 Networks BIG-IP

Published: December 22, 2019 Updated: December 24, 2019

Security Bulletin ID SB2019122201
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 20% Low 80%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 vulnerabilities.


1) Input validation error (CVE-ID: CVE-2019-6684)

CWE-ID: CWE-20 - Improper input validation

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


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

The vulnerability exists due to insufficient validation of vCMP packets in Traffic Management Microkernel (TMM). A remote attacker on the local network can send specially crafted broadcast IP fragments that will cause the TMM to reload, resulting in a denial of service (DoS) attack.


2) Input validation error (CVE-ID: CVE-2019-6678)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 insufficient validation of user-supplied input within the Traffic Management Microkernel (TMM) process. A remote attacker can send specially crafted traffic to the affected device and cause its reload.


3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-6685)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

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


The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists due to improper privilege management. A remote user access to edit iRules is able to create iRules that may allow to change system configuration and execute arbitrary commands.


4) Input validation error (CVE-ID: CVE-2019-6677)

CWE-ID: CWE-20 - Improper input validation

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


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

The vulnerability exists due to insufficient validation of user-supplied input within the Traffic Management Microkernel (TMM) process, when using custom TCP congestion control settings in a TCP profile. A remote attacker can send specially crafted traffic to the device and cause TMM to stop processing traffic when handled by an iRule.


5) Information disclosure (CVE-ID: CVE-2019-6688)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to unspecified error that allows an SNMP user to obtain the secret used to encrypt the BIG-IP UCS backup file. A remote user can gain access to sensitive information and use it to perform further attacks.


Remediation

Install update from vendor's website.

References