CVE-2017-1000208

A vulnerability in Swagger-Parsers (version <= 1.0.30) yaml parsing functionality results in arbitrary code being executed when a maliciously crafted yaml Open-API specification is parsed. This in particular, affects the generate and validate command in swagger-codegen (<= 2.2.2) and can lead to arbitrary code being executed when these commands are used on a well-crafted yaml specification.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• https://github.com/swagger-api/swagger-parser/releases/tag/v1.0.31
• https://lgtm.com/blog/swagger_snakeyaml_CVE-2017-1000207_CVE-2017-1000208
• https://github.com/swagger-api/swagger-parser/releases/tag/v1.0.31
• https://lgtm.com/blog/swagger_snakeyaml_CVE-2017-1000207_CVE-2017-1000208