Описание
SnakeYaml Constructor Deserialization Remote Code Execution
Summary
SnakeYaml's Constructor class, which inherits from SafeConstructor, allows
any type be deserialized given the following line:
new Yaml(new Constructor(TestDataClass.class)).load(yamlContent);
Types do not have to match the types of properties in the
target class. A ConstructorException is thrown, but only after a malicious
payload is deserialized.
Severity
High, lack of type checks during deserialization allows remote code execution.
Proof of Concept
Execute bash run.sh. The PoC uses Constructor to deserialize a payload
for RCE. RCE is demonstrated by using a payload which performs a http request to
http://127.0.0.1:8000.
Example output of successful run of proof of concept:
Further Analysis
Potential mitigations include, leveraging SnakeYaml's SafeConstructor while parsing untrusted content.
See https://bitbucket.org/snakeyaml/snakeyaml/issues/561/cve-2022-1471-vulnerability-in#comment-64581479 for discussion on the subject.
Timeline
Date reported: 4/11/2022 Date fixed: 30/12/2022 Date disclosed: 10/13/2022
Ссылки
- https://github.com/google/security-research/security/advisories/GHSA-mjmj-j48q-9wg2
- https://nvd.nist.gov/vuln/detail/CVE-2022-1471
- https://www.github.com/mbechler/marshalsec/blob/master/marshalsec.pdf?raw=true
- https://snyk.io/blog/unsafe-deserialization-snakeyaml-java-cve-2022-1471
- https://security.netapp.com/advisory/ntap-20240621-0006
- https://security.netapp.com/advisory/ntap-20230818-0015
- https://infosecwriteups.com/%EF%B8%8F-inside-the-160-comment-fight-to-fix-snakeyamls-rce-default-1a20c5ca4d4c
- https://groups.google.com/g/kubernetes-security-announce/c/mwrakFaEdnc
- https://github.com/mbechler/marshalsec
- https://confluence.atlassian.com/security/cve-2022-1471-snakeyaml-library-rce-vulnerability-in-multiple-products-1296171009.html
- https://bitbucket.org/snakeyaml/snakeyaml/wiki/CVE-2022-1471
- https://bitbucket.org/snakeyaml/snakeyaml/issues/561/cve-2022-1471-vulnerability-in#comment-64876314
- https://bitbucket.org/snakeyaml/snakeyaml/issues/561/cve-2022-1471-vulnerability-in#comment-64634374
- https://bitbucket.org/snakeyaml/snakeyaml/issues/561/cve-2022-1471-vulnerability-in#comment-64581479
- https://bitbucket.org/snakeyaml/snakeyaml/commits/acc44099f5f4af26ff86b4e4e4cc1c874e2dc5c4
- https://bitbucket.org/snakeyaml/snakeyaml/commits/5014df1a36f50aca54405bb8433bc99a8847f758
- http://packetstormsecurity.com/files/175095/PyTorch-Model-Server-Registration-Deserialization-Remote-Code-Execution.html
- http://www.openwall.com/lists/oss-security/2023/11/19/1
Пакеты
org.yaml:snakeyaml
<= 1.33
2.0
Связанные уязвимости
SnakeYaml's Constructor() class does not restrict types which can be instantiated during deserialization. Deserializing yaml content provided by an attacker can lead to remote code execution. We recommend using SnakeYaml's SafeConsturctor when parsing untrusted content to restrict deserialization. We recommend upgrading to version 2.0 and beyond.
SnakeYaml's Constructor() class does not restrict types which can be instantiated during deserialization. Deserializing yaml content provided by an attacker can lead to remote code execution. We recommend using SnakeYaml's SafeConsturctor when parsing untrusted content to restrict deserialization. We recommend upgrading to version 2.0 and beyond.
SnakeYaml's Constructor() class does not restrict types which can be instantiated during deserialization. Deserializing yaml content provided by an attacker can lead to remote code execution. We recommend using SnakeYaml's SafeConsturctor when parsing untrusted content to restrict deserialization. We recommend upgrading to version 2.0 and beyond.
SnakeYaml's Constructor() class does not restrict types which can be i ...
