Published: 20/03/2020 Updated: 08/11/2022

CVSS v2 Base Score: 5 | Impact Score: 2.9 | Exploitability Score: 10

CVSS v3 Base Score: 7.5 | Impact Score: 3.6 | Exploitability Score: 3.9

VMScore: 445

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

A flaw was found in the way certificate signatures could be forged using collisions found in the SHA-1 algorithm. An attacker could use this weakness to create forged certificate signatures. This issue affects GnuPG versions prior to 2.2.18.

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Debian Bug report logs - #945859 gnupg2: CVE-2019-14855: Web of Trust forgeries using collisions in SHA-1 signatures Package: src:gnupg2; Maintainer for src:gnupg2 is Debian GnuPG Maintainers <pkg-gnupg-maint@listsaliothdebianorg>; Reported by: Salvatore Bonaccorso <carnil@debianorg> Date: Fri, 29 Nov 2019 23:24:0 ...

Chosen-Prefix Collision Attack Against SHA-1 Hash Function

We have computed the very first chosen-prefix collision for SHA-1 In a nutshell, this means a complete and practical break of the SHA-1 hash function, with dangerous practical implications if you are still using this hash function To put it in another way: all attacks that are practical on MD5 are now also practical on SHA-1 Check our paper here for more details Slides fr

CWE-326 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14855 https://rwc.iacr.org/2020/slides/Leurent.pdf https://lists.gnupg.org/pipermail/gnupg-announce/2019q4/000442.html https://dev.gnupg.org/T4755 https://usn.ubuntu.com/4516-1/https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=945859 https://nvd.nist.gov https://github.com/SHA-mbles/SHA-mbles.github.io

CVE-2019-14855

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