Security Bulletin: CVE-2021-4104 CVE-2021-44228 CVE-2019-17571 IBM UCD server/agent/relay releases before 220.127.116.11 are impacted by CVE-2021-4104 (a weaker variant of CVE-2021-44228)
IBM UCD server/agent/relay releases before 18.104.22.168 are impacted by CVE-2021-4104 (a weaker variant of CVE-2021-44228). The product uses log4j 1.2 which lacks the features need to construct the most dangerous form of the exploit. It does have an exploitable weakness that requires administrative access to exploit. If you are affected, please download and install Fix4Log4j.zip available in Fix Central. Releases 22.214.171.124 or greater are not vulnerable to any variant of CVE-2021-44228. CVE-2021-4104 (the weaker variant of CVE-2021-44228 that affects log4j 1.2) requires a logging configuration change to exploit. This requires administrative access to the Settings screen to gain further privilege
DESCRIPTION: Apache Log4j could allow a remote attacker to execute arbitrary code on the system, caused by the deserialization of untrusted data when the attacker has write access to the Log4j configuration. If the deployed application is configured to use JMSAppender, an attacker could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base score: 8.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215048 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
DESCRIPTION: Apache Log4j could allow a remote attacker to execute arbitrary code on the system, caused by improper deserialization of untrusted data in SocketServer. By sending a specially-crafted request, an attacker could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base score: 9.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/173314 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
DESCRIPTION: Apache Log4j could allow a remote attacker to execute arbitrary code on the system, caused by the failure to protect against attacker controlled LDAP and other JNDI related endpoints by JNDI features. By sending a specially crafted code string, an attacker could exploit this vulnerability to load arbitrary Java code on the server and take complete control of the system.Note: The vulnerability is also called Log4Shell or LogJam.
CVSS Base score: 10
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/214921 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
Affected Products and Versions:
|UCD – IBM UrbanCode Deploy||126.96.36.199|
|UCD – IBM UrbanCode Deploy||7.1.1.x|
|UCD – IBM UrbanCode Deploy||7.1.0.x|
|UCD – IBM UrbanCode Deploy||7.0.x|
|UCD – IBM UrbanCode Deploy||6.2.x|
Starting in 188.8.131.52, we have fixed this issue as a side-effect of fixing another CVE (CVE-2019-17571) by removing all networked “appenders”, which include removal of the “JMSAppender” that is subject to CVE-2021-4104. We are providing a fix in Fix Central (Fix4Log4j.zip) to apply this change to all past versions of UCD.
Workarounds and Mitigations:
We recommend applying the fix only to the server. Agents, relays, and plugins may contain the exploit, but it does not elevate user privileges in regards to remote code execution (RCE), so is not considered a vulnerability.
The Process-as-code (PAC) feature added in 7.1.1 uses the log4j2 jar that is vulnerable to CVE-2021-44228, but this utility is only executed on the client machine of a process developer. This code cannot be executed by the server and does not elevate privilege on client machines. To avoid false positives by security scan tools, delete pacc.zip from directory $SERVER/opt/tomcat/webapps/ROOT/tools. If you are a customer using the PAC feature, contact support to get a replacement that does not contain false positives.
CVE-2021-4104 https://nvd.nist.gov/vuln/detail/CVE-2021-4104 ( https://access.redhat.com/security/cve/CVE-2021-4104 )
12 Jan 2022: corrections and link to security bulletin: https://www.ibm.com/support/pages/node/6538590
13 Dec 2021: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an “industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response.” IBM PROVIDES THE CVSS SCORES “”AS IS”” WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.