Side-Channel Attack Vulnerability in Libgcrypt Affecting OpenPGP
CVE-2021-33560
7.5HIGH
Key Information:
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👾 Exploit Exists🟡 Public PoC
What is CVE-2021-33560?
A flaw in Libgcrypt versions prior to 1.8.8 and 1.9.x before 1.9.3 compromises ElGamal encryption due to a lack of exponent blinding. This oversight allows for potential side-channel attacks through mpi_powm, making systems utilizing ElGamal in OpenPGP susceptible. The vulnerability highlights the importance of proper design in cryptographic implementations to mitigate risks associated with side-channel attacks.
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.