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go: fix CVE-2025-58188

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Validating certificate chains which contain DSA public keys can cause
programs to panic, due to a interface cast that assumes they implement
the Equal method. This affects programs which validate arbitrary certificate chains.

(From OE-Core rev: b532fa208d0b102326642a2fba8b17661a14307e)

Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Archana Polampalli 2025-11-07 15:50:59 +05:30 committed by Steve Sakoman
parent a6d452646e
commit 8c87818a10
2 changed files with 195 additions and 0 deletions
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1
meta/recipes-devtools/go/go-1.22.12.inc
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@ -23,6 +23,7 @@ SRC_URI += "\
file://CVE-2025-47906.patch \
file://CVE-2025-58185.patch \
file://CVE-2025-58187.patch \
file://CVE-2025-58188.patch \
"
SRC_URI[main.sha256sum] = "012a7e1f37f362c0918c1dfa3334458ac2da1628c4b9cf4d9ca02db986e17d71"

194
meta/recipes-devtools/go/go/CVE-2025-58188.patch Normal file
View File

@ -0,0 +1,194 @@
From f9f198ab05e3282cbf6b13251d47d9141981e401 Mon Sep 17 00:00:00 2001
From: Neal Patel <nealpatel@google.com>
Date: Thu, 11 Sep 2025 16:27:04 -0400
Subject: [PATCH] [release-branch.go1.24] crypto/x509: mitigate DoS vector when
intermediate certificate contains DSA public key An attacker could craft an
intermediate X.509 certificate containing a DSA public key and can crash a
remote host with an unauthenticated call to any endpoint that verifies the
certificate chain.
Thank you to Jakub Ciolek for reporting this issue.
Fixes CVE-2025-58188
For #75675
Fixes #75702
Change-Id: I2ecbb87b9b8268dbc55c8795891e596ab60f0088
Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2780
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2964
Reviewed-on: https://go-review.googlesource.com/c/go/+/709836
TryBot-Bypass: Michael Pratt <mpratt@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Michael Pratt <mpratt@google.com>
CVE: CVE-2025-58188
Upstream-Status: Backport [https://github.com/golang/go/commit/f9f198ab05e3282cbf6b13251d47d9141981e401]
Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
---
src/crypto/x509/verify.go | 5 +-
src/crypto/x509/verify_test.go | 126 +++++++++++++++++++++++++++++++++
2 files changed, 130 insertions(+), 1 deletion(-)
diff --git a/src/crypto/x509/verify.go b/src/crypto/x509/verify.go
index 4502d4c..14cd23f 100644
--- a/src/crypto/x509/verify.go
+++ b/src/crypto/x509/verify.go
@@ -868,7 +868,10 @@ func alreadyInChain(candidate *Certificate, chain []*Certificate) bool {
if !bytes.Equal(candidate.RawSubject, cert.RawSubject) {
continue
}
- if !candidate.PublicKey.(pubKeyEqual).Equal(cert.PublicKey) {
+ // We enforce the canonical encoding of SPKI (by only allowing the
+ // correct AI paremeter encodings in parseCertificate), so it's safe to
+ // directly compare the raw bytes.
+ if !bytes.Equal(candidate.RawSubjectPublicKeyInfo, cert.RawSubjectPublicKeyInfo) {
continue
}
var certSAN *pkix.Extension
diff --git a/src/crypto/x509/verify_test.go b/src/crypto/x509/verify_test.go
index 8a7a5f6..4a7d8da 100644
--- a/src/crypto/x509/verify_test.go
+++ b/src/crypto/x509/verify_test.go
@@ -6,6 +6,7 @@ package x509
import (
"crypto"
+ "crypto/dsa"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
@@ -2811,3 +2812,128 @@ func TestVerifyNilPubKey(t *testing.T) {
t.Fatalf("buildChains returned unexpected error, got: %v, want %v", err, UnknownAuthorityError{})
}
}
+func TestCertificateChainSignedByECDSA(t *testing.T) {
+ caKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+ if err != nil {
+ t.Fatal(err)
+ }
+ root := &Certificate{
+ SerialNumber: big.NewInt(1),
+ Subject: pkix.Name{CommonName: "X"},
+ NotBefore: time.Now().Add(-time.Hour),
+ NotAfter: time.Now().Add(365 * 24 * time.Hour),
+ IsCA: true,
+ KeyUsage: KeyUsageCertSign | KeyUsageCRLSign,
+ BasicConstraintsValid: true,
+ }
+ caDER, err := CreateCertificate(rand.Reader, root, root, &caKey.PublicKey, caKey)
+ if err != nil {
+ t.Fatal(err)
+ }
+ root, err = ParseCertificate(caDER)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ leafKey, _ := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+ leaf := &Certificate{
+ SerialNumber: big.NewInt(42),
+ Subject: pkix.Name{CommonName: "leaf"},
+ NotBefore: time.Now().Add(-10 * time.Minute),
+ NotAfter: time.Now().Add(24 * time.Hour),
+ KeyUsage: KeyUsageDigitalSignature,
+ ExtKeyUsage: []ExtKeyUsage{ExtKeyUsageServerAuth},
+ BasicConstraintsValid: true,
+ }
+ leafDER, err := CreateCertificate(rand.Reader, leaf, root, &leafKey.PublicKey, caKey)
+ if err != nil {
+ t.Fatal(err)
+ }
+ leaf, err = ParseCertificate(leafDER)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ inter, err := ParseCertificate(dsaSelfSignedCNX(t))
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ inters := NewCertPool()
+ inters.AddCert(root)
+ inters.AddCert(inter)
+
+ wantErr := "certificate signed by unknown authority"
+ _, err = leaf.Verify(VerifyOptions{Intermediates: inters, Roots: NewCertPool()})
+ if !strings.Contains(err.Error(), wantErr) {
+ t.Errorf("got %v, want %q", err, wantErr)
+ }
+}
+
+// dsaSelfSignedCNX produces DER-encoded
+// certificate with the properties:
+//
+// Subject=Issuer=CN=X
+// DSA SPKI
+// Matching inner/outer signature OIDs
+// Dummy ECDSA signature
+func dsaSelfSignedCNX(t *testing.T) []byte {
+ t.Helper()
+ var params dsa.Parameters
+ if err := dsa.GenerateParameters(&params, rand.Reader, dsa.L1024N160); err != nil {
+ t.Fatal(err)
+ }
+
+ var dsaPriv dsa.PrivateKey
+ dsaPriv.Parameters = params
+ if err := dsa.GenerateKey(&dsaPriv, rand.Reader); err != nil {
+ t.Fatal(err)
+ }
+ dsaPub := &dsaPriv.PublicKey
+
+ type dsaParams struct{ P, Q, G *big.Int }
+ paramDER, err := asn1.Marshal(dsaParams{dsaPub.P, dsaPub.Q, dsaPub.G})
+ if err != nil {
+ t.Fatal(err)
+ }
+ yDER, err := asn1.Marshal(dsaPub.Y)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ spki := publicKeyInfo{
+ Algorithm: pkix.AlgorithmIdentifier{
+ Algorithm: oidPublicKeyDSA,
+ Parameters: asn1.RawValue{FullBytes: paramDER},
+ },
+ PublicKey: asn1.BitString{Bytes: yDER, BitLength: 8 * len(yDER)},
+ }
+
+ rdn := pkix.Name{CommonName: "X"}.ToRDNSequence()
+ b, err := asn1.Marshal(rdn)
+ if err != nil {
+ t.Fatal(err)
+ }
+ rawName := asn1.RawValue{FullBytes: b}
+
+ algoIdent := pkix.AlgorithmIdentifier{Algorithm: oidSignatureDSAWithSHA256}
+ tbs := tbsCertificate{
+ Version: 0,
+ SerialNumber: big.NewInt(1002),
+ SignatureAlgorithm: algoIdent,
+ Issuer: rawName,
+ Validity: validity{NotBefore: time.Now().Add(-time.Hour), NotAfter: time.Now().Add(24 * time.Hour)},
+ Subject: rawName,
+ PublicKey: spki,
+ }
+ c := certificate{
+ TBSCertificate: tbs,
+ SignatureAlgorithm: algoIdent,
+ SignatureValue: asn1.BitString{Bytes: []byte{0}, BitLength: 8},
+ }
+ dsaDER, err := asn1.Marshal(c)
+ if err != nil {
+ t.Fatal(err)
+ }
+ return dsaDER
+}
--
2.40.0