In OpenSSL 1.1.0 before 1.1.0c, applications parsing invalid CMS structures can crash with a NULL pointer dereference. This is caused by a bug in the handling of the ASN.1 CHOICE type in OpenSSL 1.1.0 which can result in a NULL value being passed to the structure callback if an attempt is made to free certain invalid encodings. Only CHOICE structures using a callback which do not handle NULL value are affected.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openssl | Openssl | 1.1.0 (including) | 1.1.0 (including) |
| Openssl | Openssl | 1.1.0a (including) | 1.1.0a (including) |
| Openssl | Openssl | 1.1.0b (including) | 1.1.0b (including) |
Potential Mitigations
References
- http://www.securityfocus.com/bid/94244
- http://www.securitytracker.com/id/1037261
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US\u0026docId=emr_na-hpesbhf03744en_us
- https://www.openssl.org/news/secadv/20161110.txt
- http://www.securityfocus.com/bid/94244
- http://www.securitytracker.com/id/1037261
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US\u0026docId=emr_na-hpesbhf03744en_us
- https://www.openssl.org/news/secadv/20161110.txt