CVE-2026-95105 (GCVE-0-2026-95105)
Vulnerability from cvelistv5
Published
2026-10-06 08:37
Modified
2026-10-06 11:40
CWE
  • CWE-649 - Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking
Summary
Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping. Cloak.Ciphers.AES.CTR encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. decrypt/2 checks only the key tag and the minimum length before it returns the plaintext, and Cloak.Ciphers.Deprecated.AES.CTR decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error. This issue affects cloak: from 0.1.0-pre onward.
Impacted products
Vendor Product Version
danielberkompas cloak Version: 0.1.0-pre   ≤
    cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*
Create a notification for this product.
   danielberkompas cloak Version: 2bd17019e285b55c5c218cc842537bf9280f24c3
    cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website


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              "value": "\u003cp\u003eConfigure the vault with \u003ccode\u003eCloak.Ciphers.AES.GCM\u003c/code\u003e as the default cipher and re-encrypt existing values, for example with the \u003ccode\u003ecloak.migrate.ecto\u003c/code\u003e task from cloak_ecto. Then remove \u003ccode\u003eCloak.Ciphers.AES.CTR\u003c/code\u003e and \u003ccode\u003eCloak.Ciphers.Deprecated.AES.CTR\u003c/code\u003e from the vault configuration, so that ciphertext in the CTR format is no longer decrypted. AES-GCM authenticates the ciphertext and rejects modified values.\u003c/p\u003e"
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              "value": "\u003col\u003e\n\u003cli\u003eEncrypt \u003ccode\u003e\"role=user \"\u003c/code\u003e with \u003ccode\u003eCloak.Ciphers.AES.CTR.encrypt/2\u003c/code\u003e and a random 32-byte key.\u003c/li\u003e\n\u003cli\u003eWithout the key, XOR the last 10 bytes of the result (the ciphertext body) with \u003ccode\u003e:crypto.exor(\"role=user \", \"role=admin\")\u003c/code\u003e. Leave the key tag and the IV unchanged.\u003c/li\u003e\n\u003cli\u003eCall \u003ccode\u003eCloak.Ciphers.AES.CTR.decrypt/2\u003c/code\u003e on the modified value. It returns \u003ccode\u003e{:ok, \"role=admin\"}\u003c/code\u003e.\u003c/li\u003e\n\u003c/ol\u003e"
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Then remove Cloak.Ciphers.AES.CTR and Cloak.Ciphers.Deprecated.AES.CTR from the vault configuration, so that ciphertext in the CTR format is no longer decrypted. AES-GCM authenticates the ciphertext and rejects modified values.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eConfigure the vault with \u003ccode\u003eCloak.Ciphers.AES.GCM\u003c/code\u003e as the default cipher and re-encrypt existing values, for example with the \u003ccode\u003ecloak.migrate.ecto\u003c/code\u003e task from cloak_ecto. Then remove \u003ccode\u003eCloak.Ciphers.AES.CTR\u003c/code\u003e and \u003ccode\u003eCloak.Ciphers.Deprecated.AES.CTR\u003c/code\u003e from the vault configuration, so that ciphertext in the CTR format is no longer decrypted. AES-GCM authenticates the ciphertext and rejects modified values.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Configure the vault with `Cloak.Ciphers.AES.GCM` as the default cipher and re-encrypt existing values, for example with the `cloak.migrate.ecto` task from cloak_ecto. Then remove `Cloak.Ciphers.AES.CTR` and `Cloak.Ciphers.Deprecated.AES.CTR` from the vault configuration, so that ciphertext in the CTR format is no longer decrypted. AES-GCM authenticates the ciphertext and rejects modified values.\", \"base64\": false}]}], \"dateAssigned\": \"2026-10-06T08:37:34.000Z\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping.\\n\\nCloak.Ciphers.AES.CTR encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. decrypt/2 checks only the key tag and the minimum length before it returns the plaintext, and Cloak.Ciphers.Deprecated.AES.CTR decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error.\\n\\nThis issue affects cloak: from 0.1.0-pre onward.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eReliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping.\u003c/p\u003e\\n\u003cp\u003e\u003ccode\u003eCloak.Ciphers.AES.CTR\u003c/code\u003e encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. \u003ccode\u003edecrypt/2\u003c/code\u003e checks only the key tag and the minimum length before it returns the plaintext, and \u003ccode\u003eCloak.Ciphers.Deprecated.AES.CTR\u003c/code\u003e decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error.\u003c/p\u003e\\n\u003cp\u003eThis issue affects cloak: from 0.1.0-pre onward.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping.\\n\\n`Cloak.Ciphers.AES.CTR` encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. `decrypt/2` checks only the key tag and the minimum length before it returns the plaintext, and `Cloak.Ciphers.Deprecated.AES.CTR` decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error.\\n\\nThis issue affects cloak: from 0.1.0-pre onward.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-649\", \"description\": \"CWE-649 Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:danielberkompas:cloak:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"0.1.0-pre\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-10-06T08:37:56.987Z\"}, \"x_proofOfConcept\": [{\"lang\": \"en\", \"value\": \"* Encrypt \\\"role=user \\\" with Cloak.Ciphers.AES.CTR.encrypt/2 and a random 32-byte key.\\n* Without the key, XOR the last 10 bytes of the result (the ciphertext body) with :crypto.exor(\\\"role=user \\\", \\\"role=admin\\\"). Leave the key tag and the IV unchanged.\\n* Call Cloak.Ciphers.AES.CTR.decrypt/2 on the modified value. It returns {:ok, \\\"role=admin\\\"}.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003col\u003e\\n\u003cli\u003eEncrypt \u003ccode\u003e\\\"role=user \\\"\u003c/code\u003e with \u003ccode\u003eCloak.Ciphers.AES.CTR.encrypt/2\u003c/code\u003e and a random 32-byte key.\u003c/li\u003e\\n\u003cli\u003eWithout the key, XOR the last 10 bytes of the result (the ciphertext body) with \u003ccode\u003e:crypto.exor(\\\"role=user \\\", \\\"role=admin\\\")\u003c/code\u003e. Leave the key tag and the IV unchanged.\u003c/li\u003e\\n\u003cli\u003eCall \u003ccode\u003eCloak.Ciphers.AES.CTR.decrypt/2\u003c/code\u003e on the modified value. It returns \u003ccode\u003e{:ok, \\\"role=admin\\\"}\u003c/code\u003e.\u003c/li\u003e\\n\u003c/ol\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"1. Encrypt `\\\"role=user \\\"` with `Cloak.Ciphers.AES.CTR.encrypt/2` and a random 32-byte key.\\n2. Without the key, XOR the last 10 bytes of the result (the ciphertext body) with `:crypto.exor(\\\"role=user \\\", \\\"role=admin\\\")`. Leave the key tag and the IV unchanged.\\n3. Call `Cloak.Ciphers.AES.CTR.decrypt/2` on the modified value. It returns `{:ok, \\\"role=admin\\\"}`.\", \"base64\": false}]}]}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-95105\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-06T11:40:42.775Z\", \"dateReserved\": \"2026-09-25T07:00:01.880Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-10-06T08:37:56.987Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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