CVEs-PoC/2021/CVE-2021-32761.md

### [CVE-2021-32761](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32761)
![](https://img.shields.io/static/v1?label=Product&message=redis&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-125%3A%20Out-of-bounds%20Read&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-680%3A%20Integer%20Overflow%20to%20Buffer%20Overflow&color=brighgreen)

### Description

Redis is an in-memory database that persists on disk. A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13, 6.0.15, and 6.2.5. On 32-bit systems, Redis `*BIT*` command are vulnerable to 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.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/eeenvik1/scripts_for_YouTrack