GO-2023-1987

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Source

https://pkg.go.dev/vuln/GO-2023-1987

Import Source

https://vuln.go.dev/ID/GO-2023-1987.json

JSON Data

https://api.osv.dev/v1/vulns/GO-2023-1987

Aliases

Published

2023-08-02T17:25:58Z

Modified

2024-05-20T16:03:47Z

Summary

Large RSA keys can cause high CPU usage in crypto/tls

Details

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures.

With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits.

Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.

References

Credits

- Mateusz Poliwczak

Affected packages

Go / stdlib

Package

Name: stdlib; View open source insights on deps.dev
Purl: pkg:golang/stdlib

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.19.12

Introduced

1.20.0-0

Fixed

1.20.7

Introduced

1.21.0-0

Fixed

1.21.0-rc.4

Ecosystem specific

{
    "imports": [
        {
            "path": "crypto/tls",
            "symbols": [
                "Conn.Handshake",
                "Conn.HandshakeContext",
                "Conn.Read",
                "Conn.Write",
                "Conn.processCertsFromClient",
                "Conn.verifyServerCertificate",
                "Dial",
                "DialWithDialer",
                "Dialer.Dial",
                "Dialer.DialContext"
            ]
        }
    ]
}