Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%

CVE-2021-34558 PoC — Google Golang 信任管理问题漏洞

Source
Associated Vulnerability
Title:Google Golang 信任管理问题漏洞 (CVE-2021-34558)
Description:The crypto/tls package of Go through 1.16.5 does not properly assert that the type of public key in an X.509 certificate matches the expected type when doing a RSA based key exchange, allowing a malicious TLS server to cause a TLS client to panic.
Readme
# POC for CVE-2021-34558

```bash
# Run the malicious TLS server
go run main.go -mode server 

# Run a normal `http.Get` client call against the server which panics
go run main.go -mode client
```

There is a minor modification to `./vendor/github.com/refraction-networking/utls/handshake_server.go` to enable the malicious handshake to be sent with a mismatching certificate/cipher.

It looks like this:

    $ go run main.go -mode client

    panic: interface conversion: interface {} is *ecdsa.PublicKey, not *rsa.PublicKey

    goroutine 7 [running]:
    crypto/tls.rsaKeyAgreement.generateClientKeyExchange(0xc000001c80, 0xc00014a000, 0xc000130580, 0x0, 0x0, 0x4, 0x6e9da0, 0x7fe73e42e201, 0xc00001c758)
            /usr/local/go/src/crypto/tls/key_agreement.go:70 +0x3a6
    crypto/tls.(*clientHandshakeState).doFullHandshake(0xc00015fd48, 0xc00001a380, 0x31)
            /usr/local/go/src/crypto/tls/handshake_client.go:574 +0x5e9
    crypto/tls.(*clientHandshakeState).handshake(0xc00015fd48, 0xc00001c418, 0x4)
            /usr/local/go/src/crypto/tls/handshake_client.go:421 +0x566
    crypto/tls.(*Conn).clientHandshake(0xc00007f180, 0x0, 0x0)
            /usr/local/go/src/crypto/tls/handshake_client.go:220 +0x754
    crypto/tls.(*Conn).Handshake(0xc00007f180, 0x0, 0x0)
            /usr/local/go/src/crypto/tls/conn.go:1391 +0xc9
    net/http.(*persistConn).addTLS.func2(0x0, 0xc00007f180, 0x0, 0xc0000624e0)
            /usr/local/go/src/net/http/transport.go:1530 +0x45
    created by net/http.(*persistConn).addTLS
            /usr/local/go/src/net/http/transport.go:1526 +0x1f6
    exit status 2

A patched version of Go (1.16.6+) does not crash:

    $ go run main.go -mode client
    2021/07/13 06:13:50 <nil> Get "https://127.0.0.1:8443/": tls: server certificate contains incorrect key type for selected ciphersuite
File Snapshot

[4.0K] /data/pocs/ab98db22efe5eb2f4172a02bfc7113858106d96e ├── [ 272] go.mod ├── [1.3K] go.sum ├── [2.3K] main.go ├── [1.8K] README.md └── [4.0K] vendor ├── [4.0K] github.com │   └── [4.0K] refraction-networking │   └── [4.0K] utls │   ├── [2.9K] alert.go │   ├── [6.9K] auth.go │   ├── [ 16K] cipher_suites.go │   ├── [ 41K] common.go │   ├── [ 43K] conn.go │   ├── [ 968] CONTRIBUTING.md │   ├── [3.5K] CONTRIBUTORS_GUIDE.md │   ├── [4.0K] cpu │   │   ├── [1.5K] cpu_arm64.go │   │   ├── [ 198] cpu_arm.go │   │   ├── [2.3K] cpu.go │   │   ├── [ 198] cpu_mips64.go │   │   ├── [ 198] cpu_mips64le.go │   │   ├── [ 198] cpu_mips.go │   │   ├── [ 198] cpu_mipsle.go │   │   ├── [1.8K] cpu_ppc64x.go │   │   ├── [ 235] cpu_riscv64.go │   │   ├── [ 199] cpu_s390x.go │   │   ├── [1.4K] cpu_x86.go │   │   └── [ 689] cpu_x86.s │   ├── [ 30K] handshake_client.go │   ├── [ 21K] handshake_client_tls13.go │   ├── [ 47K] handshake_messages.go │   ├── [ 22K] handshake_server.go │   ├── [ 26K] handshake_server_tls13.go │   ├── [9.9K] key_agreement.go │   ├── [5.9K] key_schedule.go │   ├── [1.4K] LICENSE │   ├── [ 23K] logo.png │   ├── [2.0K] logo_small.png │   ├── [ 11K] prf.go │   ├── [ 13K] README.md │   ├── [6.1K] ticket.go │   ├── [9.7K] tls.go │   ├── [7.6K] u_common.go │   ├── [ 18K] u_conn.go │   ├── [ 13K] u_fingerprinter.go │   ├── [ 28K] u_parrots.go │   ├── [3.7K] u_prng.go │   ├── [ 19K] u_public.go │   ├── [2.7K] u_roller.go │   └── [ 18K] u_tls_extensions.go ├── [4.0K] golang.org │   └── [4.0K] x │   ├── [4.0K] crypto │   │   ├── [ 174] AUTHORS │   │   ├── [4.0K] chacha20 │   │   │   ├── [ 479] chacha_arm64.go │   │   │   ├── [8.0K] chacha_arm64.s │   │   │   ├── [ 14K] chacha_generic.go │   │   │   ├── [ 441] chacha_noasm.go │   │   │   ├── [ 468] chacha_ppc64le.go │   │   │   ├── [9.1K] chacha_ppc64le.s │   │   │   ├── [ 761] chacha_s390x.go │   │   │   ├── [5.4K] chacha_s390x.s │   │   │   └── [1.2K] xor.go │   │   ├── [4.0K] chacha20poly1305 │   │   │   ├── [2.4K] chacha20poly1305_amd64.go │   │   │   ├── [105K] chacha20poly1305_amd64.s │   │   │   ├── [2.1K] chacha20poly1305_generic.go │   │   │   ├── [2.6K] chacha20poly1305.go │   │   │   ├── [ 562] chacha20poly1305_noasm.go │   │   │   └── [2.5K] xchacha20poly1305.go │   │   ├── [ 171] CONTRIBUTORS │   │   ├── [4.0K] cryptobyte │   │   │   ├── [4.0K] asn1 │   │   │   │   └── [1.6K] asn1.go │   │   │   ├── [ 21K] asn1.go │   │   │   ├── [9.4K] builder.go │   │   │   └── [4.4K] string.go │   │   ├── [4.0K] curve25519 │   │   │   ├── [4.0K] curve25519.go │   │   │   └── [4.0K] internal │   │   │   └── [4.0K] field │   │   │   ├── [ 397] fe_amd64.go │   │   │   ├── [ 354] fe_amd64_noasm.go │   │   │   ├── [5.7K] fe_amd64.s │   │   │   ├── [ 365] fe_arm64.go │   │   │   ├── [ 325] fe_arm64_noasm.go │   │   │   ├── [1.1K] fe_arm64.s │   │   │   ├── [8.4K] fe_generic.go │   │   │   ├── [ 12K] fe.go │   │   │   ├── [ 370] README │   │   │   ├── [ 41] sync.checkpoint │   │   │   └── [ 611] sync.sh │   │   ├── [4.0K] hkdf │   │   │   └── [2.7K] hkdf.go │   │   ├── [4.0K] internal │   │   │   └── [4.0K] subtle │   │   │   ├── [1.2K] aliasing.go │   │   │   └── [1.4K] aliasing_purego.go │   │   ├── [1.4K] LICENSE │   │   ├── [1.3K] PATENTS │   │   ├── [4.0K] poly1305 │   │   │   ├── [ 956] bits_compat.go │   │   │   ├── [ 501] bits_go1.13.go │   │   │   ├── [ 312] mac_noasm.go │   │   │   ├── [3.3K] poly1305.go │   │   │   ├── [1.1K] sum_amd64.go │   │   │   ├── [2.5K] sum_amd64.s │   │   │   ├── [9.5K] sum_generic.go │   │   │   ├── [1.1K] sum_ppc64le.go │   │   │   ├── [3.3K] sum_ppc64le.s │   │   │   ├── [2.0K] sum_s390x.go │   │   │   └── [ 17K] sum_s390x.s │   │   └── [4.0K] sha3 │   │   ├── [3.1K] doc.go │   │   ├── [ 841] hashes_generic.go │   │   ├── [2.7K] hashes.go │   │   ├── [ 336] keccakf_amd64.go │   │   ├── [ 14K] keccakf_amd64.s │   │   ├── [9.8K] keccakf.go │   │   ├── [ 430] register.go │   │   ├── [5.7K] sha3.go │   │   ├── [6.8K] sha3_s390x.go │   │   ├── [ 978] sha3_s390x.s │   │   ├── [ 553] shake_generic.go │   │   ├── [5.3K] shake.go │   │   ├── [ 679] xor_generic.go │   │   ├── [ 617] xor.go │   │   └── [1.4K] xor_unaligned.go │   └── [4.0K] sys │   ├── [ 173] AUTHORS │   ├── [ 170] CONTRIBUTORS │   ├── [4.0K] cpu │   │   ├── [ 420] asm_aix_ppc64.s │   │   ├── [1.8K] byteorder.go │   │   ├── [ 619] cpu_aix.go │   │   ├── [3.5K] cpu_arm64.go │   │   ├── [ 771] cpu_arm64.s │   │   ├── [2.1K] cpu_arm.go │   │   ├── [ 269] cpu_gc_arm64.go │   │   ├── [ 315] cpu_gccgo_arm64.go │   │   ├── [1.0K] cpu_gccgo_s390x.go │   │   ├── [1.2K] cpu_gccgo_x86.c │   │   ├── [ 840] cpu_gccgo_x86.go │   │   ├── [ 687] cpu_gc_s390x.go │   │   ├── [ 681] cpu_gc_x86.go │   │   ├── [ 12K] cpu.go │   │   ├── [2.1K] cpu_linux_arm64.go │   │   ├── [1.4K] cpu_linux_arm.go │   │   ├── [ 361] cpu_linux.go │   │   ├── [ 522] cpu_linux_mips64x.go │   │   ├── [ 351] cpu_linux_noinit.go │   │   ├── [ 815] cpu_linux_ppc64x.go │   │   ├── [ 890] cpu_linux_s390x.go │   │   ├── [ 346] cpu_mips64x.go │   │   ├── [ 270] cpu_mipsx.go │   │   ├── [4.3K] cpu_netbsd_arm64.go │   │   ├── [ 260] cpu_other_arm64.go │   │   ├── [ 239] cpu_other_arm.go │   │   ├── [ 299] cpu_other_mips64x.go │   │   ├── [ 384] cpu_ppc64x.go │   │   ├── [ 259] cpu_riscv64.go │   │   ├── [4.9K] cpu_s390x.go │   │   ├── [2.0K] cpu_s390x.s │   │   ├── [ 454] cpu_wasm.go │   │   ├── [4.6K] cpu_x86.go │   │   ├── [1.5K] cpu_x86.s │   │   ├── [ 223] cpu_zos.go │   │   ├── [ 643] cpu_zos_s390x.go │   │   ├── [1.2K] hwcap_linux.go │   │   ├── [ 745] syscall_aix_gccgo.go │   │   └── [1011] syscall_aix_ppc64_gc.go │   ├── [1.4K] LICENSE │   └── [1.3K] PATENTS └── [ 648] modules.txt 22 directories, 153 files
Shenlong Bot has cached this for you
Remarks
    1. It is advised to access via the original source first.
    2. Local POC snapshots are reserved for subscribers — if the original source is unavailable, the local mirror is part of the paid plan.
    3. Mirroring, verifying, and maintaining this POC archive takes ongoing effort, so local snapshots are a paid feature. Your subscription keeps the archive online — thank you for the support. View subscription plans →