GSD-2020-8911
Vulnerability from gsd - Updated: 2023-12-13 01:21Details
A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target's S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC's ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-8911",
"description": "A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target\u0027s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC\u0027s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.",
"id": "GSD-2020-8911",
"references": [
"https://access.redhat.com/errata/RHSA-2021:3851"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
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],
"details": "A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target\u0027s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC\u0027s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.",
"id": "GSD-2020-8911",
"modified": "2023-12-13T01:21:53.695855Z",
"schema_version": "1.4.0"
}
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"date": "2023-02-14",
"description": "A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target\u0027s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC\u0027s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.",
"fixed_versions": [
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"identifier": "CVE-2020-8911",
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"package_slug": "go/github.com/aws/aws-sdk-go",
"pubdate": "2022-02-11",
"solution": "Upgrade to version 1.34.0 or above.",
"title": "Use of a Broken or Risky Cryptographic Algorithm",
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"https://github.com/aws/aws-sdk-go/pull/3403",
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"https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09",
"https://bugzilla.redhat.com/show_bug.cgi?id=1869800",
"https://github.com/sophieschmieg/exploits/tree/master/aws_s3_crypto_poc",
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"description": "A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target\u0027s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) *length (plaintext) queries to the endpoint, by exploiting CBC\u0027s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.",
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"pubdate": "2022-02-11",
"solution": "Upgrade to version 1.34.0 or above.",
"title": "Use of a Broken or Risky Cryptographic Algorithm",
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"https://github.com/aws/aws-sdk-go/pull/3403",
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"https://bugzilla.redhat.com/show_bug.cgi?id=1869800",
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"lastModifiedDate": "2020-08-18T13:37Z",
"publishedDate": "2020-08-11T20:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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