CVE-2021-4238

Insufficient randomness in github.com/Masterminds/goutils

Critical · published December 27, 2022

CVSS v3.1
9.1
EPSS
1%
Percentile
71.4
In the wild
Unconfirmed
What it is

🔥 A critical flaw hides in your randomness! The RandomAlphaNumeric and CryptoRandomAlphaNumeric functions churn out strings with way less entropy than you might think, putting your security at serious risk! Imagine you're baking a cake but using the same three ingredients over and over again; no matter how you dress it up, it’s still the same bland flavor. This vulnerability is like a recipe for predictability – if the strings are too similar, attackers can easily crack them! An attacker could exploit this flaw to predict generated strings, undermining the security of sessions, tokens, or cryptographic keys that rely on those strings. With a CVSS score of 9.1, the stakes are high—your sensitive information could be exposed, leading to unauthorized access and potential data breaches.

Put simply

Imagine you're baking a cake but using the same three ingredients over and over again; no matter how you dress it up, it’s still the same bland flavor. This vulnerability is like a recipe for predictability – if the strings are too similar, attackers can easily crack them! This vulnerability results from the RandomAlphaNumeric and CryptoRandomAlphaNumeric functions consistently including at least one digit in their randomly generated strings, reducing overall entropy and predictability.

What to do

An attacker could exploit this flaw to predict generated strings, undermining the security of sessions, tokens, or cryptographic keys that rely on those strings. With a CVSS score of 9.1, the stakes are high—your sensitive information could be exposed, leading to unauthorized access and potential data breaches. To remediate this, developers should replace the affected functions with more secure alternatives that ensure true randomness. Review your code for any instances using these functions and update them accordingly. This is a must-fix—don't wait! You've got this! By taking action now, you can safeguard your applications and boost your security hero status! 🛡️

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.01357 · 71.4th percentile
Published
2022-12-27T21:13Z
EPSS history
Timeline
  • 27 DEC 21:13Z
    Insufficient randomness in github.com/Masterminds/goutils
    cvelistv5