Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.
3.2.7-0ubuntu0.22.04.63.2.7-1ubuntu1.43.4.1+ds1-5ubuntu1.23.4.1+ds1-7ubuntu0.23.1.0-2ubuntu0.4+esm33.1.1-3ubuntu1.3+esm53.1.2-2.1ubuntu1.6+esm33.1.3-8ubuntu0.9+esm1Exploitability
AV:NAC:HAT:NPR:NUI:AVulnerable System
VC:NVI:NVA:LSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N