CVE-2019-14855: Weak Encryption
First published: Fri Mar 20 2020(Updated: )
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 before 2.2.18.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Gnupg Gnupg | <2.2.18 | |
| Fedoraproject Fedora | =30 | |
| Fedoraproject Fedora | =31 | |
| Canonical Ubuntu Linux | =18.04 | |
| ubuntu/gnupg2 | <2.2.4-1ubuntu1.3 | 2.2.4-1ubuntu1.3 |
| ubuntu/gnupg2 | <2.2.19-1 | 2.2.19-1 |
| debian/gnupg1 | <=1.4.23-1.1<=1.4.23-2 | |
| debian/gnupg2 | 2.2.27-2+deb11u2 2.2.40-1.1 2.2.43-8 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14855
- https://dev.gnupg.org/T4755
- https://lists.gnupg.org/pipermail/gnupg-announce/2019q4/000442.html
- https://rwc.iacr.org/2020/slides/Leurent.pdf
- https://usn.ubuntu.com/4516-1/
- https://launchpad.net/bugs/cve/CVE-2019-14855
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=commit;h=c4f2d9e3e1d77d2f1f168764fcdfed32f7d1dfc4
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=commit;h=7d9aad63c4f1aefe97da61baf5acd96c12c0278e
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=commit;h=dd18be979e138dd3712315ee390463e8ee1fe8c1
- https://eprint.iacr.org/2020/014.pdf
- https://security-tracker.debian.org/tracker/CVE-2019-14855
- https://ubuntu.com/security/notices/USN-4516-1
- https://www.cve.org/CVERecord?id=CVE-2019-14855
- https://nvd.nist.gov/vuln/detail/CVE-2019-14855
- https://github.com/gpg/gnupg/commit/c4f2d9e3e1d77d2f1f168764fcdfed32f7d1dfc4
- https://github.com/gpg/gnupg/commit/7d9aad63c4f1aefe97da61baf5acd96c12c0278e
- https://github.com/gpg/gnupg/commit/e624c41dbafd33af82c1153188d14de72fcc7cd8
- https://github.com/gpg/gnupg/commit/dd18be979e138dd3712315ee390463e8ee1fe8c1
- https://github.com/gpg/gnupg/commit/edc36f59fcfcb4b896a53530345d586f7e5df560
- https://github.com/gpg/gnupg/commit/3b1fcf65239d9c73cc54760ea52a5749e024fa76
- https://github.com/gpg/gnupg/commit/754a03f5a279964af62025d11d92391e650fddb7
- https://github.com/gpg/gnupg/commit/8e49fc7f43ecfe44dac57d97c555e2cbc7eb8e9a
- https://ubuntu.com/security/CVE-2019-14855
Frequently Asked Questions
What is CVE-2019-14855?
CVE-2019-14855 is a vulnerability that allows an attacker to forge certificate signatures using collisions found in the SHA-1 algorithm.
What software versions are affected by CVE-2019-14855?
GnuPG versions before 2.2.18, gnupg1 before 1.4.23-1.1, gnupg2 before 2.2.12-1+deb10u2, gnupg2 before 2.2.4-1ubuntu1.3, gnupg2 before 2.2.19-1 are affected.
What is the severity of CVE-2019-14855?
CVE-2019-14855 has a severity rating of 7.5 (high).
How can an attacker exploit CVE-2019-14855?
An attacker can exploit CVE-2019-14855 to create forged certificate signatures.
Where can I find more information about CVE-2019-14855?
You can find more information about CVE-2019-14855 at the following references: [link1](https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14855), [link2](https://dev.gnupg.org/T4755), [link3](https://lists.gnupg.org/pipermail/gnupg-announce/2019q4/000442.html).
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