CVE-2022-23772: Uncontrolled memory consumption in math/big

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Background

The 'math/big' package in the Go standard library provides arbitrary-precision arithmetic operations on integers and floating-point numbers. It is commonly used for handling large numbers and performing precise calculations. However, a vulnerability has been discovered in the 'Rat.SetString' function of the 'math/big' package, which can lead to uncontrolled memory consumption.

Vulnerability Detail

The 'Rat.SetString' function in the 'math/big' package has an overflow issue that can be exploited to consume excessive amounts of memory. This vulnerability can be triggered by passing a specially crafted string as input to the function. An attacker could potentially abuse this vulnerability to cause a denial-of-service (DoS) condition by exhausting system resources. The issue was identified by Emmanuel Odeke.

go get stdlib@vgo1.25.5

Workaround

As a temporary workaround, developers can validate and sanitize user input before passing it to the 'Rat.SetString' function. By implementing proper input validation, the risk of triggering the vulnerability can be mitigated. Here is an example of how to sanitize the input:

import (
	"math/big"
	"strconv"
)

func sanitizeInput(input string) (*big.Rat, error) {
	_, err := strconv.ParseFloat(input, 64)
	if err != nil {
		return nil, err
	}

	r := new(big.Rat)
	r.SetFloat64(input)

	return r, nil
}

Conclusion

The 'math/big' package in Go is vulnerable to uncontrolled memory consumption due to an overflow issue in the 'Rat.SetString' function. This vulnerability can be mitigated by updating to the patched versions of Go (1.16.14 or 1.17.7) and implementing proper input validation. It is important to stay informed about vulnerabilities and regularly update dependencies to ensure the security of your applications. For further support on vulnerability remediation, you can contact DevNack.com.

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