Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://github.com/pyca/pyopenssl/pull/723 | third party advisory patch |
| https://access.redhat.com/errata/RHSA-2019:0085 | third party advisory vendor advisory |
| https://usn.ubuntu.com/3813-1/ | third party advisory vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.html | mailing list third party advisory vendor advisory |
| https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509 |