Proof that HMAC-DRBG has No Back Doors

New research: "Verified Correctness and Security of mbedTLS HMAC-DRBG," by Katherine Q. Ye, Matthew Green, Naphat Sanguansin, Lennart Beringer, Adam Petcher, and Andrew W. Appel. Abstract: We have formalized the functional specification of HMAC-DRBG NIST 800-90A, and we have proved its...

PYSEC-2017-24

In PyJWT 1.5.0 and below the invalidstrings check in HMACAlgorithm.preparekey does not account for all PEM encoded public keys. Specifically, the PKCS1 PEM encoded format would be allowed because it is prefaced with the string -----BEGIN RSA PUBLIC KEY----- which is not accounted for. This enable...

Padding Oracle Attack

nimbus-jose-jwt is vulnerable to padding oracle attacks. It does not act correctly if an invalid HMAC is detected in authenticated AES-CBC decryption...

Authentication Bypass

nimbus-jose-jwt is vulnerable to authentication bypass. The bypass exists because the library ignores the checking of integer-overflow when converting length values from bytes to bits. A malicious user can shift Additional Authenticated Data AAD and ciphertext, resulting in a different plaintext...

Nimbus JOSE+JWT Security Bypass Vulnerability

Nimbus JOSE+JWT is an open source Java library . Nimbus JOSE+JWT fails to perform integer overflow detection, allowing remote attackers to exploit vulnerabilities to perform HMAC bypass attacks by sniffing AAD and ciphertext...

Integer overflow

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data AAD and ciphertext so that different plaintext is obtained for the same HMAC...

CVE-2017-12972

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data AAD and ciphertext so that different plaintext is obtained for the same HMAC...

Design/Logic Flaw

Nimbus JOSE+JWT before 4.39 proceeds improperly after detection of an invalid HMAC in authenticated AES-CBC decryption, which allows attackers to conduct a padding oracle attack...

CVE-2017-12972

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data AAD and ciphertext so that different plaintext is obtained for the same HMAC...

CVE-2017-12972

CVE-2017-12972 : Nimbus JOSE+JWT before 4.39 has no integer-overflow check when converting length values from bytes to bits, enabling a remote attacker to perform a HMAC bypass by shifting AAD and ciphertext so different plaintext yields the same HMAC. Public records show this vulnerability discu...

CVE-2017-12972

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data AAD and ciphertext so that different plaintext is obtained for the same HMAC...

CVE-2017-12973

Nimbus JOSE+JWT before 4.39 proceeds improperly after detection of an invalid HMAC in authenticated AES-CBC decryption, which allows attackers to conduct a padding oracle attack...

CVE-2017-12973

Nimbus JOSE+JWT prior to 4.39 proceeds after detecting an invalid HMAC in authenticated AES-CBC decryption, enabling a padding oracle attack. Affected: Nimbus JOSE+JWT library (Connect2id). Risk: padding oracle could leak data or enable exploitation. Remediation: upgrade to version 4.39 or later ...

CVE-2017-12972: Insufficient Verification of Data Authenticity

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data AAD and ciphertext so that different plaintext is obtained for the same HMAC...

CVE-2017-12973: Improper Validation of Integrity Check Value

Nimbus JOSE+JWT before 4.39 proceeds improperly after detection of an invalid HMAC in authenticated AES-CBC decryption, which allows attackers to conduct a padding oracle attack...

Zomato: Length extension attack leading to HTML injection

At the profile setting page where I can set my personal website I found this url: https://www.zomato.com/redirect?u=xxx&t=yyy Where xxx is the url that we can control and yyy is the hash. Through out blackbox testing I find out that if md5somescret + url == t then the redirect is allowed. This is...

UBUNTU-CVE-2017-7524

tpm2-tools versions before 1.1.1 are vulnerable to a password leak due to transmitting password in plaintext from client to server when generating HMAC...

CVE-2017-7524

tpm2-tools versions before 1.1.1 are vulnerable to a password leak due to transmitting password in plaintext from client to server when generating HMAC...

Design/Logic Flaw

tpm2-tools versions before 1.1.1 are vulnerable to a password leak due to transmitting password in plaintext from client to server when generating HMAC...

CVE-2017-7524

tpm2-tools versions before 1.1.1 are vulnerable to a password leak due to transmitting password in plaintext from client to server when generating HMAC...