Rsync: Out of bounds array access via negative index

Vulnerability Description

A malicious client acting as the receiver of an rsync file transfer can trigger an out of bounds read of a heap based buffer, via a negative array index. The malicious rsync client requires at least read access to the remote rsync module in order to trigger the issue.

References

• https://github.com/RsyncProject/rsync/commit/797e17fc4a6f15e3b1756538a9f812b63942686f
• https://attackerkb.com/assessments/fbacb2a6-d1cd-4011-bb3a-f06b1c8306b1