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CVE-2021-23351

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

Impact

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 packages

EcosystemPackageAffectedFixed in
gogithub.com/pires/go-proxyproto< 0.5.00.5.0

Affected products

VendorProductAffected versions
Go-Proxyproto ProjectGo-Proxyproto
before 0.5.0
FedoraprojectFedora
Versions 33, 34

Weakness classification

CWE-400

References