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{"affected_release": [{"advisory": "RHSA-2021:4409", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "libgcrypt-0:1.8.5-6.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-09T00:00:00Z"}], "bugzilla": {"description": "libgcrypt: mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm", "id": "1970096", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1970096"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-327", "details": ["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.", "A side-channel attack flaw was found in the way libgcrypt implemented Elgamal encryption. This flaw allows an attacker to decrypt parts of ciphertext encrypted using Elgamal, for example, when using OpenPGP. The highest threat from this vulnerability is to confidentiality."], "name": "CVE-2021-33560", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "libgcrypt", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "libgcrypt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "libgcrypt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-06-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-33560\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-33560\nhttps://dev.gnupg.org/T5328"], "threat_severity": "Moderate", "upstream_fix": "libgcrypt 1.8.8, libgcrypt 1.9.3"}