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| purl | pkg:maven/org.yaml/snakeyaml@1.32 |
| Vulnerability | Summary | Fixed by |
|---|---|---|
|
VCID-dmkc-42vj-gbhc
Aliases: CVE-2022-1471 GHSA-mjmj-j48q-9wg2 |
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: ``` $ bash run.sh [+] Downloading snakeyaml if needed [+] Starting mock HTTP server on 127.0.0.1:8000 to demonstrate RCE nc: no process found [+] Compiling and running Proof of Concept, which a payload that sends a HTTP request to mock web server. [+] An exception is expected. Exception: Cannot create property=payload for JavaBean=Main$TestDataClass@3cbbc1e0 in 'string', line 1, column 1: payload: !!javax.script.ScriptEn ... ^ Can not set java.lang.String field Main$TestDataClass.payload to javax.script.ScriptEngineManager in 'string', line 1, column 10: payload: !!javax.script.ScriptEngineManag ... ^ at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:291) at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.construct(Constructor.java:172) at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:332) at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:230) at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:220) at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:174) at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:158) at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:491) at org.yaml.snakeyaml.Yaml.load(Yaml.java:416) at Main.main(Main.java:37) Caused by: java.lang.IllegalArgumentException: Can not set java.lang.String field Main$TestDataClass.payload to javax.script.ScriptEngineManager at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) at java.base/jdk.internal.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81) at java.base/java.lang.reflect.Field.set(Field.java:780) at org.yaml.snakeyaml.introspector.FieldProperty.set(FieldProperty.java:44) at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:286) ... 9 more [+] Dumping Received HTTP Request. Will not be empty if PoC worked GET /proof-of-concept HTTP/1.1 User-Agent: Java/11.0.14 Host: localhost:8000 Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2 Connection: keep-alive ``` ### 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](https://bitbucket.org/snakeyaml/snakeyaml/pull-requests/44) **Date disclosed**: 10/13/2022 |
Affected by 0 other vulnerabilities. |
| Vulnerability | Summary | Aliases |
|---|---|---|
| VCID-fb8u-g65k-hffs | snakeYAML before 1.32 vulnerable to Denial of Service due to Out-of-bounds Write Using snakeYAML to parse untrusted YAML files may be vulnerable to Denial of Service attacks (DoS). If the parser is running on user supplied input, an attacker may supply content that causes the parser to crash by stack-overflow. |
CVE-2022-38752
GHSA-9w3m-gqgf-c4p9 |
| VCID-sqsn-ygsg-yfdu | Snakeyaml vulnerable to Stack overflow leading to denial of service Those using Snakeyaml to parse untrusted YAML files may be vulnerable to Denial of Service attacks (DOS). If the parser is running on user supplied input, an attacker may supply content that causes the parser to crash by stack overflow. This effect may support a denial of service attack. |
CVE-2022-41854
GHSA-w37g-rhq8-7m4j |