GHSA-3w6p-8f82-gw8r
Using JMSAppender in log4j configuration may lead to deserialization of untrusted data
GHSA-3w6p-8f82-gw8r is a high vulnerability (CVSS 8.1) in ru.yandex.clickhouse:clickhouse-jdbc-bridge, published December 17, 2021. No source lists public exploit code. Fixed in ru.yandex.clickhouse:clickhouse-jdbc-bridge 2.0.7.
- Severity
- 8.1 HighCVSS 3.1, GitHub Advisories
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
2.0.7ru.yandex.clickhouse:clickhouse-jdbc-bridge +1 more
Description
Impact
ClickHouse JDBC Bridge uses slf4j-log4j12 1.7.32, which depends on log4j 1.2.17. It allows a remote attacker to execute code on the server, if you changed default log4j configuration by adding JMSAppender and an insecure JMS broker.
Patches
The patch version 2.0.7 removed log4j dependency by replacing slf4j-log4j12 to slf4j-jdk14. Logging configuration is also changed from log4j.properties to logging.properties.
Workarounds
- Do NOT change log4j configuration to use JMSAppender along with insecure JMS broker
- Alternatively, you can issue below command to remove
JMSAppender.class:
# install zip command if you don't have
apt-get update && apt-get install -y zip
# remove the class
zip -d clickhouse-jdbc-bridge*.jar ru/yandex/clickhouse/jdbcbridge/internal/log4j/net/JMSAppender.class
References
Please refer to CVE-2021-4104 to read more.
For more information
If you have any questions or comments about this advisory, please feel free to open an issue in the repository.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Affected packages
| Package | Affected | Fixed |
|---|---|---|
ru.yandex.clickhouse:clickhouse-jdbc-bridgeMaven | before 2.0.7 | 2.0.7 |
ru.yandex.clickhouse:clickhouse-jdbc-bridgeMaven | before 2.0.7, plus listed versions 1.2.02.0.02.0.12.0.22.0.32.0.42.0.52.0.6 | 2.0.7 |
What each source reports
GitHub Advisories Score used
Using JMSAppender in log4j configuration may lead to deserialization of untrusted data
Impact
ClickHouse JDBC Bridge uses slf4j-log4j12 1.7.32, which depends on log4j 1.2.17. It allows a remote attacker to execute code on the server, if you changed default log4j configuration by adding JMSAppender and an insecure JMS broker.
Patches
The patch version 2.0.7 removed log4j dependency by replacing slf4j-log4j12 to slf4j-jdk14. Logging configuration is also changed from log4j.properties to logging.properties.
Workarounds
- Do NOT change log4j configuration to use JMSAppender along with insecure JMS broker
- Alternatively, you can issue below command to remove
JMSAppender.class:
# install zip command if you don't have
apt-get update && apt-get install -y zip
# remove the class
zip -d clickhouse-jdbc-bridge*.jar ru/yandex/clickhouse/jdbcbridge/internal/log4j/net/JMSAppender.class
References
Please refer to CVE-2021-4104 to read more.
For more information
If you have any questions or comments about this advisory, please feel free to open an issue in the repository.
- Record
GHSA-3w6p-8f82-gw8r- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
OSV
Using JMSAppender in log4j configuration may lead to deserialization of untrusted data
Impact
ClickHouse JDBC Bridge uses slf4j-log4j12 1.7.32, which depends on log4j 1.2.17. It allows a remote attacker to execute code on the server, if you changed default log4j configuration by adding JMSAppender and an insecure JMS broker.
Patches
The patch version 2.0.7 removed log4j dependency by replacing slf4j-log4j12 to slf4j-jdk14. Logging configuration is also changed from log4j.properties to logging.properties.
Workarounds
- Do NOT change log4j configuration to use JMSAppender along with insecure JMS broker
- Alternatively, you can issue below command to remove
JMSAppender.class:
# install zip command if you don't have
apt-get update && apt-get install -y zip
# remove the class
zip -d clickhouse-jdbc-bridge*.jar ru/yandex/clickhouse/jdbcbridge/internal/log4j/net/JMSAppender.class
References
Please refer to CVE-2021-4104 to read more.
For more information
If you have any questions or comments about this advisory, please feel free to open an issue in the repository.
- Record
GHSA-3w6p-8f82-gw8r- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.