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lib/net: Limit the maximum size of TCP or SSL input buffers 

This commit is the 2/3 part of the fix for the following security
vulnerability:
 - CVE-2021-42076 DoS via excess length messages

The issue has been reported by Matthias Gerstner <mgerstner@suse.de>.
This commit is contained in:
Povilas Kanapickas 2021-11-01 05:18:52 +02:00
parent e33c81b835
commit af90f39b4a
2 changed files with 10 additions and 3 deletions
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5
src/lib/net/SecureSocket.cpp
View File

@ -43,6 +43,7 @@
#define MAX_ERROR_SIZE 65535 #define MAX_ERROR_SIZE 65535
static const std::size_t MAX_INPUT_BUFFER_SIZE = 1024 * 1024;
static const float s_retryDelay = 0.01f; static const float s_retryDelay = 0.01f;
enum { enum {
@ -178,6 +179,10 @@ SecureSocket::doRead()
do { do {
m_inputBuffer.write(buffer, bytesRead); m_inputBuffer.write(buffer, bytesRead);
if (m_inputBuffer.getSize() > MAX_INPUT_BUFFER_SIZE) {
break;
}
status = secureRead(buffer, sizeof(buffer), bytesRead); status = secureRead(buffer, sizeof(buffer), bytesRead);
if (status < 0) { if (status < 0) {
return kBreak; return kBreak;

8
src/lib/net/TCPSocket.cpp
View File

@ -33,9 +33,7 @@
#include <cstdlib> #include <cstdlib>
#include <memory> #include <memory>
// static const std::size_t MAX_INPUT_BUFFER_SIZE = 1024 * 1024;
// TCPSocket
//
TCPSocket::TCPSocket(IEventQueue* events, SocketMultiplexer* socketMultiplexer, IArchNetwork::EAddressFamily family) : TCPSocket::TCPSocket(IEventQueue* events, SocketMultiplexer* socketMultiplexer, IArchNetwork::EAddressFamily family) :
IDataSocket(events), IDataSocket(events),
@ -345,6 +343,10 @@ TCPSocket::doRead()
do { do {
m_inputBuffer.write(buffer, (UInt32)bytesRead); m_inputBuffer.write(buffer, (UInt32)bytesRead);
if (m_inputBuffer.getSize() > MAX_INPUT_BUFFER_SIZE) {
break;
}
bytesRead = ARCH->readSocket(m_socket, buffer, sizeof(buffer)); bytesRead = ARCH->readSocket(m_socket, buffer, sizeof(buffer));
} while (bytesRead > 0); } while (bytesRead > 0);