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CVE-2021-33560

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Date: June 7, 2021

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.

Language: C

Severity Score

Related Resources (20)

https://dev.gnupg.org/T5328
https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
https://security.alpinelinux.org/vuln/CVE-2021-33560
https://nvd.nist.gov/vuln/detail/CVE-2021-33560
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/
https://dev.gnupg.org/T5305
https://access.redhat.com/security/cve/CVE-2021-33560
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33560
https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
https://dev.gnupg.org/T5466
https://security-tracker.debian.org/tracker/CVE-2021-33560
https://www.oracle.com/security-alerts/cpujan2022.html
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.oracle.com/security-alerts/cpujul2022.html
https://security.gentoo.org/glsa/202210-13
https://www.oracle.com/security-alerts/cpuoct2021.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/
https://www.mend.io/vulnerability-database/CVE-2021-33560

Severity Score

Weakness Type (CWE)

Observable Discrepancy

CWE-203

Top Fix

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Upgrade to version libgcrypt-1.9.3

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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