CVE-2022-28327: P-256 Panic Vulnerability in golang
Summary
CVE-2022-28327: The generic P-256 feature in crypto/elliptic in Go before 1.17.9 and 1.18.x before 1.18.1 allows a panic via long scalar input. Affects golang across 2 version ranges.
< 1.17.9
>= 1.18.0, < 1.18.1
Fixed in 1.17.9 or 1.18.1, depending on the release line you run. How to fix ↓
Also tracked for
- stdlib · Go
The same CVE-2022-28327 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
The golang package is a popular open-source programming language that provides a platform for building efficient and reliable software. It is widely used for developing various applications and services. The package includes the crypto/elliptic module, which offers elliptic curve cryptography functionality. However, a vulnerability has been discovered in the generic P-256 feature of the crypto/elliptic module in versions before 1.17.9 and 1.18.x before 1.18.1. This vulnerability can lead to a panic when long scalar input is provided.
Vulnerability Detail
The P-256 panic vulnerability in golang's crypto/elliptic module arises from a lack of proper input validation. When long scalar input is given, it triggers a panic, causing the program to crash. This vulnerability can be exploited by an attacker to disrupt the normal operation of affected applications or services. The impact of this vulnerability may vary depending on the context in which the affected package is used. It is crucial to promptly address this issue to ensure the security and stability of software relying on golang.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
< 1.17.91.17.9 -
>= 1.18.0, < 1.18.11.18.1
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
As a workaround, developers can implement input validation checks to ensure that the scalar input provided to the crypto/elliptic module is within the expected limits. By validating the input length and handling long scalar input appropriately, the risk of triggering the panic can be mitigated. Here is an example of how to perform input validation in Go:
func validateScalar(scalar []byte) error {
maxScalarLength := 32 // Maximum expected scalar length
if len(scalar) > maxScalarLength {
return errors.New("Scalar input exceeds maximum length")
}
// Perform additional validation if necessary
return nil
}
By incorporating this validation logic into the affected code, the vulnerability can be mitigated until the package is updated.
Conclusion
The P-256 panic vulnerability in golang's crypto/elliptic module can lead to a crash of affected applications or services when long scalar input is provided. It is crucial to update the golang package to the recommended versions (1.17.9 or later for the 1.17.x branch, and 1.18.1 or later for the 1.18.x branch) to mitigate this vulnerability. In the meantime, developers can implement input validation checks as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for golang →
FAQ
The P-256 panic vulnerability in golang can lead to a crash of affected applications or services when long scalar input is provided. This can result in service disruptions, denial of service, or other unexpected behavior.
You can use Vulert's playground at Vulert Scanner to check if your golang application is affected by this vulnerability. Simply upload your package-lock.json file and Vulert will analyze it for any open-source vulnerabilities, including the P-256 panic vulnerability.
No, only versions before 1.17.9 and 1.18.x before 1.18.1 are affected by the P-256 panic vulnerability. It is recommended to update to the latest patched versions to mitigate the risk.
Yes, developers can implement input validation checks to ensure that the scalar input provided to the crypto/elliptic module is within the expected limits. By validating the input length and handling long scalar input appropriately, the risk of triggering the panic can be mitigated.
You can refer to the official CVE-2022-28327 entry or the vulnerability database provided by Bitnami at https://github.com/bitnami/vulndb/tree/main/data/golang/BIT-golang-2022-28327.json for more detailed information about the P-256 panic vulnerability in golang.
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