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CVE-2021-33560

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-5080-2
Posted Sep 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5080-2 - USN-5080-1 fixed several vulnerabilities in Libgcrypt. This update provides the corresponding update for Ubuntu 16.04 ESM. It was discovered that Libgcrypt incorrectly handled ElGamal encryption. An attacker could possibly use this issue to recover sensitive information.

tags | advisory, vulnerability
systems | linux, ubuntu
advisories | CVE-2021-33560
MD5 | 260071d69f58b4f7ae80a17219122f52
Ubuntu Security Notice USN-5080-1
Posted Sep 16, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5080-1 - It was discovered that Libgcrypt incorrectly handled ElGamal encryption. An attacker could possibly use this issue to recover sensitive information.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2021-33560
MD5 | 8ba3b45688985f61948d6439afa102b3
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