CVE-2021-23351

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.

Affected Software

Name	Vendor	Start Version	End Version
Go-proxyproto	Go-proxyproto_project	*	0.5.0 (excluding)
Golang-github-pires-go-proxyproto	Ubuntu	esm-apps/jammy	*
Golang-github-pires-go-proxyproto	Ubuntu	hirsute	*
Golang-github-pires-go-proxyproto	Ubuntu	impish	*
Golang-github-pires-go-proxyproto	Ubuntu	jammy	*
Golang-github-pires-go-proxyproto	Ubuntu	kinetic	*
Golang-github-pires-go-proxyproto	Ubuntu	lunar	*
Golang-github-pires-go-proxyproto	Ubuntu	mantic	*
Golang-github-pires-go-proxyproto	Ubuntu	trusty	*
Golang-github-pires-go-proxyproto	Ubuntu	upstream	*

NVD	https://nvd.nist.gov/vuln/detail/CVE-2021-23351
CWE	https://cwe.mitre.org/data/definitions/.html

Affected Software

References