Integer Overflow or Wraparound

Summary

Redis is an in-memory database that persists on a disk. A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 prior to 5.0.13, 6.0.x prior to 6.0.15, and 6.2.x prior to 6.2.5. On 32-bit systems, Redis `*BIT*` commands are vulnerable to an integer overflow that can potentially be exploited to corrupt the heap, leak arbitrary heap contents or trigger remote code execution. The vulnerability involves changing the default `proto-max-bulk-len` configuration parameter to a very large value and constructing specially crafted commands bit commands. This problem only affects Redis on 32-bit platforms, or compiled as a 32-bit binary. Redis versions 5.0.`3m 6.0.15, and 6.2.5 contain patches for this issue. An additional workaround to mitigate the problem without patching the `redis-server` executable is to prevent users from modifying the `proto-max-bulk-len` configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.