Vulnerability in core server (CVE-2023-5868)

Memory disclosure in aggregate function calls

Certain aggregate function calls receiving “unknown”-type arguments could disclose bytes of server memory from the end of the “unknown”-type value to the next zero byte. One typically gets an “unknown”-type value via a string literal having no type designation. We have not confirmed or ruled out viability of attacks that arrange for presence of notable, confidential information in disclosed bytes.

The PostgreSQL project thanks Jingzhou Fu for reporting this problem.