Snyk test report

Denial of Service (DoS)

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Overview

gopkg.in/yaml.v3 is a YAML support package for the Go language. Affected versions of this package are vulnerable to Denial of Service (DoS) via the Unmarshal function, which causes the program to crash when attempting to deserialize invalid input.

PoC

package main
        
        import (
            "gopkg.in/yaml.v3"
        )
        
        func main() {
            var t interface{}
            yaml.Unmarshal([]byte("0: [:!00 \xef"), &t)
        }
        

Details

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

Remediation

Upgrade gopkg.in/yaml.v3 to version 3.0.0 or higher.

References

• GitHub Commit
• GitHub Issue

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NULL Pointer Dereference

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Overview

gopkg.in/yaml.v3 is a YAML support package for the Go language. Affected versions of this package are vulnerable to NULL Pointer Dereference when parsing #\n-\n-\n0 via the parserc.go parser.

PoC

package main
        
        import (
            "gopkg.in/yaml.v3"
        )
        
        func main() {
            var t interface{}
            yaml.Unmarshal([]byte("#\n-\n-\n0"), &t)
        }
        

Remediation

Upgrade gopkg.in/yaml.v3 to version 3.0.1 or higher.

References

• GitHub Commit
• GitHub Issue

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Denial of Service (DoS)

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Overview

Affected versions of this package are vulnerable to Denial of Service (DoS) such that a maliciously crafted HTTP/2 stream could cause excessive CPU consumption in the HPACK decoder.

Details

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

Remediation

Upgrade golang.org/x/net/http2/hpack to version 0.7.0 or higher.

References

• GitHub Commit
• GitHub Commit
• GitHub Issue
• Google Groups Forum

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Denial of Service

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Overview

golang.org/x/net/http2 is a work-in-progress HTTP/2 implementation for Go. Affected versions of this package are vulnerable to Denial of Service as an HTTP/2 connection can hang during closing if a shutdown was preempted by a fatal error.

Remediation

Upgrade golang.org/x/net/http2 to version 0.0.0-20220906165146-f3363e06e74c, 1.18.6, 1.19.1 or higher.

References

• GitHub Commit
• GitHub Issues

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Denial of Service (DoS)

---

Overview

golang.org/x/net/http2 is a work-in-progress HTTP/2 implementation for Go. Affected versions of this package are vulnerable to Denial of Service (DoS) such that a maliciously crafted HTTP/2 stream could cause excessive CPU consumption in the HPACK decoder.

Details

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

Remediation

Upgrade golang.org/x/net/http2 to version 0.7.0 or higher.

References

• GitHub Commit
• GitHub Commit
• GitHub Issue
• Google Groups Forum

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