From a44b07bad1ae0c68e7219f4cb4902f0674e8c72b Mon Sep 17 00:00:00 2001 From: bwzhang Date: Tue, 2 Apr 2024 09:17:35 +0800 Subject: [PATCH] fix CVE-2023-48795 --- 0008-fix-CVE-2023-48795.patch | 275 ++++++++++++++++++++++++++++++++++ cri-o.spec | 9 +- 2 files changed, 283 insertions(+), 1 deletion(-) create mode 100644 0008-fix-CVE-2023-48795.patch diff --git a/0008-fix-CVE-2023-48795.patch b/0008-fix-CVE-2023-48795.patch new file mode 100644 index 0000000..fc3599d --- /dev/null +++ b/0008-fix-CVE-2023-48795.patch @@ -0,0 +1,275 @@ +From f8a809e46dcf040ffb98a7da355f36fa96f57e38 Mon Sep 17 00:00:00 2001 +From: bwzhang +Date: Tue, 26 Mar 2024 16:06:23 +0800 +Subject: [PATCH] fix CVE-2023-48795 +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +ssh: implement strict KEX protocol changes + +Implement the "strict KEX" protocol changes, as described in section +1.9 of the OpenSSH PROTOCOL file (as of OpenSSH version 9.6/9.6p1). + +Namely this makes the following changes: + * Both the server and the client add an additional algorithm to the + initial KEXINIT message, indicating support for the strict KEX mode. + * When one side of the connection sees the strict KEX extension + algorithm, the strict KEX mode is enabled for messages originating + from the other side of the connection. If the sequence number for + the side which requested the extension is not 1 (indicating that it + has already received non-KEXINIT packets), the connection is + terminated. + * When strict kex mode is enabled, unexpected messages during the + handshake are considered fatal. Additionally when a key change + occurs (on the receipt of the NEWKEYS message) the message sequence + numbers are reset. + +Thanks to Fabian Bäumer, Marcus Brinkmann, and Jörg Schwenk from Ruhr +University Bochum for reporting this issue. + +Fixes CVE-2023-48795 +Fixes golang/go#64784 + +Change-Id: I96b53afd2bd2fb94d2b6f2a46a5dacf325357604 +Reviewed-on: https://go-review.googlesource.com/c/crypto/+/550715 +Reviewed-by: Nicola Murino +Reviewed-by: Tatiana Bradley +TryBot-Result: Gopher Robot +Run-TryBot: Roland Shoemaker +Reviewed-by: Damien Neil +LUCI-TryBot-Result: Go LUCI +--- + vendor/golang.org/x/crypto/ssh/handshake.go | 62 ++++++++++++++++++++- + vendor/golang.org/x/crypto/ssh/transport.go | 32 +++++++++-- + 2 files changed, 87 insertions(+), 7 deletions(-) + +diff --git a/vendor/golang.org/x/crypto/ssh/handshake.go b/vendor/golang.org/x/crypto/ssh/handshake.go +index 2b10b05..1ac7a56 100644 +--- a/vendor/golang.org/x/crypto/ssh/handshake.go ++++ b/vendor/golang.org/x/crypto/ssh/handshake.go +@@ -34,6 +34,16 @@ type keyingTransport interface { + // direction will be effected if a msgNewKeys message is sent + // or received. + prepareKeyChange(*algorithms, *kexResult) error ++ ++ // setStrictMode sets the strict KEX mode, notably triggering ++ // sequence number resets on sending or receiving msgNewKeys. ++ // If the sequence number is already > 1 when setStrictMode ++ // is called, an error is returned. ++ setStrictMode() error ++ ++ // setInitialKEXDone indicates to the transport that the initial key exchange ++ // was completed ++ setInitialKEXDone() + } + + // handshakeTransport implements rekeying on top of a keyingTransport +@@ -94,6 +104,10 @@ type handshakeTransport struct { + + // The session ID or nil if first kex did not complete yet. + sessionID []byte ++ ++ // strictMode indicates if the other side of the handshake indicated ++ // that we should be following the strict KEX protocol restrictions. ++ strictMode bool + } + + type pendingKex struct { +@@ -201,7 +215,10 @@ func (t *handshakeTransport) readLoop() { + close(t.incoming) + break + } +- if p[0] == msgIgnore || p[0] == msgDebug { ++ // If this is the first kex, and strict KEX mode is enabled, ++ // we don't ignore any messages, as they may be used to manipulate ++ // the packet sequence numbers. ++ if !(t.sessionID == nil && t.strictMode) && (p[0] == msgIgnore || p[0] == msgDebug) { + continue + } + t.incoming <- p +@@ -432,6 +449,11 @@ func (t *handshakeTransport) readOnePacket(first bool) ([]byte, error) { + return successPacket, nil + } + ++const ( ++ kexStrictClient = "kex-strict-c-v00@openssh.com" ++ kexStrictServer = "kex-strict-s-v00@openssh.com" ++) ++ + // sendKexInit sends a key change message. + func (t *handshakeTransport) sendKexInit() error { + t.mu.Lock() +@@ -445,7 +467,6 @@ func (t *handshakeTransport) sendKexInit() error { + } + + msg := &kexInitMsg{ +- KexAlgos: t.config.KeyExchanges, + CiphersClientServer: t.config.Ciphers, + CiphersServerClient: t.config.Ciphers, + MACsClientServer: t.config.MACs, +@@ -455,13 +476,36 @@ func (t *handshakeTransport) sendKexInit() error { + } + io.ReadFull(rand.Reader, msg.Cookie[:]) + ++ // We mutate the KexAlgos slice, in order to add the kex-strict extension algorithm, ++ // and possibly to add the ext-info extension algorithm. Since the slice may be the ++ // user owned KeyExchanges, we create our own slice in order to avoid using user ++ // owned memory by mistake. ++ msg.KexAlgos = make([]string, 0, len(t.config.KeyExchanges)+2) // room for kex-strict and ext-info ++ msg.KexAlgos = append(msg.KexAlgos, t.config.KeyExchanges...) ++ + if len(t.hostKeys) > 0 { + for _, k := range t.hostKeys { + msg.ServerHostKeyAlgos = append( + msg.ServerHostKeyAlgos, k.PublicKey().Type()) + } ++ ++ if t.sessionID == nil { ++ msg.KexAlgos = append(msg.KexAlgos, kexStrictServer) ++ } + } else { + msg.ServerHostKeyAlgos = t.hostKeyAlgorithms ++ ++ // As a client we opt in to receiving SSH_MSG_EXT_INFO so we know what ++ // algorithms the server supports for public key authentication. See RFC ++ // 8308, Section 2.1. ++ // ++ // We also send the strict KEX mode extension algorithm, in order to opt ++ // into the strict KEX mode. ++ if firstKeyExchange := t.sessionID == nil; firstKeyExchange { ++ msg.KexAlgos = append(msg.KexAlgos, "ext-info-c") ++ msg.KexAlgos = append(msg.KexAlgos, kexStrictClient) ++ } ++ + } + packet := Marshal(msg) + +@@ -557,6 +601,13 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error { + return err + } + ++ if t.sessionID == nil && ((isClient && contains(serverInit.KexAlgos, kexStrictServer)) || (!isClient && contains(clientInit.KexAlgos, kexStrictClient))) { ++ t.strictMode = true ++ if err := t.conn.setStrictMode(); err != nil { ++ return err ++ } ++ } ++ + // We don't send FirstKexFollows, but we handle receiving it. + // + // RFC 4253 section 7 defines the kex and the agreement method for +@@ -591,6 +642,7 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error { + return err + } + ++ firstKeyExchange := t.sessionID == nil + if t.sessionID == nil { + t.sessionID = result.H + } +@@ -608,6 +660,12 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error { + return unexpectedMessageError(msgNewKeys, packet[0]) + } + ++ if firstKeyExchange { ++ // Indicates to the transport that the first key exchange is completed ++ // after receiving SSH_MSG_NEWKEYS. ++ t.conn.setInitialKEXDone() ++ } ++ + return nil + } + +diff --git a/vendor/golang.org/x/crypto/ssh/transport.go b/vendor/golang.org/x/crypto/ssh/transport.go +index 49ddc2e..379e4a8 100644 +--- a/vendor/golang.org/x/crypto/ssh/transport.go ++++ b/vendor/golang.org/x/crypto/ssh/transport.go +@@ -48,6 +48,9 @@ type transport struct { + rand io.Reader + isClient bool + io.Closer ++ ++ strictMode bool ++ initialKEXDone bool + } + + // packetCipher represents a combination of SSH encryption/MAC +@@ -73,6 +76,18 @@ type connectionState struct { + pendingKeyChange chan packetCipher + } + ++func (t *transport) setStrictMode() error { ++ if t.reader.seqNum != 1 { ++ return errors.New("ssh: sequence number != 1 when strict KEX mode requested") ++ } ++ t.strictMode = true ++ return nil ++} ++ ++func (t *transport) setInitialKEXDone() { ++ t.initialKEXDone = true ++} ++ + // prepareKeyChange sets up key material for a keychange. The key changes in + // both directions are triggered by reading and writing a msgNewKey packet + // respectively. +@@ -111,11 +126,12 @@ func (t *transport) printPacket(p []byte, write bool) { + // Read and decrypt next packet. + func (t *transport) readPacket() (p []byte, err error) { + for { +- p, err = t.reader.readPacket(t.bufReader) ++ p, err = t.reader.readPacket(t.bufReader, t.strictMode) + if err != nil { + break + } +- if len(p) == 0 || (p[0] != msgIgnore && p[0] != msgDebug) { ++ // in strict mode we pass through DEBUG and IGNORE packets only during the initial KEX ++ if len(p) == 0 || (t.strictMode && !t.initialKEXDone) || (p[0] != msgIgnore && p[0] != msgDebug) { + break + } + } +@@ -126,7 +142,7 @@ func (t *transport) readPacket() (p []byte, err error) { + return p, err + } + +-func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) { ++func (s *connectionState) readPacket(r *bufio.Reader, strictMode bool) ([]byte, error) { + packet, err := s.packetCipher.readCipherPacket(s.seqNum, r) + s.seqNum++ + if err == nil && len(packet) == 0 { +@@ -139,6 +155,9 @@ func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) { + select { + case cipher := <-s.pendingKeyChange: + s.packetCipher = cipher ++ if strictMode { ++ s.seqNum = 0 ++ } + default: + return nil, errors.New("ssh: got bogus newkeys message") + } +@@ -169,10 +188,10 @@ func (t *transport) writePacket(packet []byte) error { + if debugTransport { + t.printPacket(packet, true) + } +- return t.writer.writePacket(t.bufWriter, t.rand, packet) ++ return t.writer.writePacket(t.bufWriter, t.rand, packet, t.strictMode) + } + +-func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet []byte) error { ++func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet []byte, strictMode bool) error { + changeKeys := len(packet) > 0 && packet[0] == msgNewKeys + + err := s.packetCipher.writeCipherPacket(s.seqNum, w, rand, packet) +@@ -187,6 +206,9 @@ func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet [] + select { + case cipher := <-s.pendingKeyChange: + s.packetCipher = cipher ++ if strictMode { ++ s.seqNum = 0 ++ } + default: + panic("ssh: no key material for msgNewKeys") + } +-- +2.20.1 + diff --git a/cri-o.spec b/cri-o.spec index efb8f3f..d008ecc 100644 --- a/cri-o.spec +++ b/cri-o.spec @@ -21,7 +21,7 @@ Name: cri-o Version: 1.23.2 Epoch: 0 -Release: 9 +Release: 10 Summary: Open Container Initiative-based implementation of Kubernetes Container Runtime Interface License: ASL 2.0 URL: https://github.com/cri-o/cri-o @@ -36,6 +36,7 @@ Patch0004: 0004-fix-CVE-2022-1708.patch Patch0005: 0005-fix-CVE-2023-39325.patch Patch0006: 0006-fix-CVE-2022-41723.patch Patch0007: 0007-fix-CVE-2024-24786.patch +Patch0008: 0008-fix-CVE-2023-48795.patch ExclusiveArch: %{?go_arches:%{go_arches}}%{!?go_arches:%{ix86} x86_64 aarch64 %{arm}} BuildRequires: golang >= 1.17, git-core, glib2-devel, glibc-static, openEuler-rpm-config @@ -166,6 +167,12 @@ install -dp %{buildroot}%{_sharedstatedir}/containers %{_datadir}/zsh/site-functions/_%{service_name}* %changelog +* Mon Apr 1 2024 zhangbowei - 0:1.23.2-10 +- Type:bugfix +- CVE:NA +- SUG:NA +- DESC: fix CVE-2023-48795 + * Mon Apr 1 2024 zhangbowei - 0:1.23.2-9 - Type:bugfix - CVE:NA