Slashdot: A 'Severe' Bug Was Found In Libgcrypt, GnuPG's Cryptographic Library

A 'Severe' Bug Was Found In Libgcrypt, GnuPG's Cryptographic Library
Published on February 01, 2021 at 03:04AM
Early Friday the principal author of GNU Privacy Guard (the free encryption software) warned that version 1.9.0 of its cryptographic library Libgcrypt, released January 19, had a "severe" security vulnerability and should not be used. A new version 1.9.1, which fixes the flaw, is available for download, Help Net Security reports: He also noted that Fedora 34 (scheduled to be released in April 2021) and Gentoo Linux are already using the vulnerable version... [I]t's a heap buffer overflow due to an incorrect assumption in the block buffer management code. Just decrypting some data can overflow a heap buffer with attacker controlled data, no verification or signature is validated before the vulnerability occurs. It was discovered and flagged by Google Project Zero researcher Tavis Ormandy and affects only Libgcrypt v1.9.0. "Exploiting this bug is simple and thus immediate action for 1.9.0 users is required..." Koch posted on the GnuPG mailing list. "The 1.9.0 tarballs on our FTP server have been renamed so that scripts won't be able to get this version anymore."

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