GHSA-fqh4-rh59-xhvf

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GHSA-fqh4-rh59-xhvf

Summary: github.com/pires/go-proxyproto denial of service vulnerability

Details: The package `github.com/pires/go-proxyproto` before 0.5.0 are vulnerable to Denial of Service (DoS) via the `parseVersion1()` function. The reader in this package is a default `bufio.Reader` wrapping a `net.Conn`. It will read from the connection until it finds a newline. Since no limits are implemented in the code, a deliberately malformed V1 header could be used to exhaust memory in a server process using this code - and create a DoS. This can be exploited by sending a stream starting with PROXY and continuing to send data (which does not contain a newline) until the target stops acknowledging. The risk here is small, because only trusted sources should be allowed to send proxy protocol headers.

References: https://nvd.nist.gov/vuln/detail/CVE-2021-23351, https://github.com/pires/go-proxyproto/issues/69, https://github.com/pires/go-proxyproto/pull/71, https://github.com/pires/go-proxyproto/commit/7f48261db810703d173f27f3309a808cc2b49b8b, https://lists.fedoraproject.org/archives/list/[email protected]/message/4BNVGJMVI3ZTZ675EFPUHPGXCKCGSX46, https://lists.fedoraproject.org/archives/list/[email protected]/message/C36IBVOZXRTWM7MGTRUTOM56P5RR74VU, https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1081577