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I have a manually created security group to access Redis, and I am creating a LAMP stack with AWS CloudFormation. I need to update the Amazon EC2 security group from Redis to allow access from this LAMP stack, but I want it to be updated through CloudFormation - is this possible?

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Existing SecurityGroups can be updated using SecurityGroupIngress

For example:

        "SecurityGroupRedisIngress": {
        "Type": "AWS::EC2::SecurityGroupIngress",
        "Properties" :
                "GroupId": "sg-123456789",
                "IpProtocol": "tcp",
                "FromPort": "6379",
                "ToPort": "6379",
                "CidrIp": ""

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