CVSS: 5.9EPSS: 0%CPEs: 1EXPL: 1CVE-2021-40528 – libgcrypt: ElGamal implementation allows plaintext recovery
https://notcve.org/view.php?id=CVE-2021-40528
The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP. Una implementación de ElGamal en Libgcrypt versiones anteriores a 1.9.4, permite una recuperación de texto plano porque, durante la interacción entre dos bibliotecas criptográficas, una determinada combinación peligrosa del primo definido por la clave pública del receptor, el generador definido por la clave pública del receptor y los exponentes efímeros del emisor puede conllevar a un ataque de configuración cruzada contra OpenPGP. A flaw was found in libgcrypt's ElGamal implementation, where it allows plain text recovery. During the interaction between two cryptographic libraries, a certain combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP. The highest threat from this vulnerability is to confidentiality. • https://eprint.iacr.org/2021/923 https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=3462280f2e23e16adf3ed5176e0f2413d8861320 https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1 https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2 https://security.gentoo.org/glsa/202210-13 https://access.redhat.com/security/cve/CVE-2021-40528 https://bugzilla.redhat.com/show_bug.cgi?id=2002816 • CWE-327: Use of a Broken or Risky Cryptographic Algorithm •
CVSS: 7.5EPSS: 0%CPEs: 13EXPL: 1CVE-2021-33560 – libgcrypt: mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm
https://notcve.org/view.php?id=CVE-2021-33560
Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP. Libgcrypt versiones anteriores a 1.8.8 y versiones 1.9.x anteriores a 1.9.3, maneja inapropiadamente el cifrado de ElGamal porque carece de cegado de exponentes para hacer frente a un ataque de canal lateral contra la función mpi_powm, y el tamaño de la ventana no se elige apropiadamente. Esto, por ejemplo, afecta el uso de ElGamal en OpenPGP. A side-channel attack flaw was found in the way libgcrypt implemented Elgamal encryption. • https://github.com/IBM/PGP-client-checker-CVE-2021-33560 https://dev.gnupg.org/T5305 https://dev.gnupg.org/T5328 https://dev.gnupg.org/T5466 https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61 https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL • CWE-203: Observable Discrepancy CWE-327: Use of a Broken or Risky Cryptographic Algorithm •
CVSS: 5.1EPSS: 0%CPEs: 15EXPL: 1CVE-2018-0495 – ROHNP: Key Extraction Side Channel in Multiple Crypto Libraries
https://notcve.org/view.php?id=CVE-2018-0495
Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host. Libgcrypt en versiones anteriores a la 1.7.10 y versiones 1.8.x anteriores a la 1.8.3 permite un ataque de canal lateral por caché de memoria en las firmas ECDSA que se puede mitigar mediante el uso de la ocultación durante el proceso de firmado en la función _gcry_ecc_ecdsa_sign en cipher/ecc-ecdsa.c. Esto también se conoce como Return Of the Hidden Number Problem o ROHNP. Para descubrir una clave ECDSA, el atacante necesita acceso a la máquina local o a una máquina virtual diferente en el mismo host físico. • http://www.securitytracker.com/id/1041144 http://www.securitytracker.com/id/1041147 https://access.redhat.com/errata/RHSA-2018:3221 https://access.redhat.com/errata/RHSA-2018:3505 https://access.redhat.com/errata/RHSA-2019:1296 https://access.redhat.com/errata/RHSA-2019:1297 https://access.redhat.com/errata/RHSA-2019:1543 https://access.redhat.com/errata/RHSA-2019:2237 https://dev.gnupg.org/T4011 https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3 • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE-203: Observable Discrepancy •
CVSS: 7.5EPSS: 0%CPEs: 1EXPL: 1CVE-2018-6829
https://notcve.org/view.php?id=CVE-2018-6829
cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for Libgcrypt's ElGamal implementation. cipher/elgamal.c en Libgcrypt hasta la versión 1.8.2, al emplearse para cifrar mensajes directamente, cifra los textos planos indebidamente, lo que permite que atacantes remotos obtengan información sensible mediante la lectura de datos en texto cifrado (p.ej., no tiene seguridad semántica a la hora de enfrentarse a un ataque solo en texto cifrado). La hipótesis DDH (Decisional Diffie-Hellman) no soporta la implementación ElGamal de Libgcrypt. • https://github.com/weikengchen/attack-on-libgcrypt-elgamal https://github.com/weikengchen/attack-on-libgcrypt-elgamal/wiki https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.html https://www.oracle.com/security-alerts/cpujan2020.html • CWE-327: Use of a Broken or Risky Cryptographic Algorithm •
CVSS: 7.5EPSS: 0%CPEs: 2EXPL: 0CVE-2017-0379
https://notcve.org/view.php?id=CVE-2017-0379
Libgcrypt before 1.8.1 does not properly consider Curve25519 side-channel attacks, which makes it easier for attackers to discover a secret key, related to cipher/ecc.c and mpi/ec.c. Libgcrypt en versiones anteriores a la 1.8.1 no considera correctamente ataques de canal lateral Curve25519, lo que facilita que los atacantes descubran una clave secreta relacionada con cipher/ecc.c y mpi/ec.c. • http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html http://www.securityfocus.com/bid/100503 http://www.securitytracker.com/id/1041294 https://bugs.debian.org/873383 https://eprint.iacr.org/2017/806 https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=da780c8183cccc8f533c8ace8211ac2cb2bdee7b https://lists.debian.org/debian-security-announce/2017/msg00221.html https://security-tracker.debian.org/tracker/CVE-2017-0379 https://security.netapp.com/advisory/ntap • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor •