CVE-2020-13777 GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authent
High 7.4
Published
Updated
Check this codebase for CVE-2020-13777 and fix it if it is affected.
What it is: CVE-2020-13777 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 4 Jun 2020.
Exploitation: There is no known exploitation of CVE-2020-13777 in the wild and no public exploit code.
Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2020-13777/ (Markdown: https://insights.sbomify.com/CVE-2020-13777/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2020-13777?
CVE-2020-13777 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 4 Jun 2020.
Official description
GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application.
Weakness: CWE-327
Which versions are affected by CVE-2020-13777?
It affects 4 products.
Linux distribution packages (40)
gnutls-c++ Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls-c++-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls-dane Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls-dane-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls-devel Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls-utils Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls-utils-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:3.6.8-11.el8_2 |
gnutls Red Hat:enterprise_linux:8::baseos | All versions | 0:3.6.8-11.el8_2 |
gnutls-c++-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:3.6.8-11.el8_2 |
gnutls-dane-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:3.6.8-11.el8_2 |
gnutls-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:3.6.8-11.el8_2 |
gnutls-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:3.6.8-11.el8_2 |
gnutls-utils-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:3.6.8-11.el8_2 |
gnutls-c++ Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls-c++-debuginfo Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls-dane Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls-dane-debuginfo Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls-debuginfo Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls-debugsource Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls-devel Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls-utils Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls-utils-debuginfo Red Hat:rhel_e4s:8.0::appstream | All versions | 0:3.6.5-3.el8_0 |
gnutls Red Hat:rhel_e4s:8.0::baseos | All versions | 0:3.6.5-3.el8_0 |
gnutls-c++-debuginfo Red Hat:rhel_e4s:8.0::baseos | All versions | 0:3.6.5-3.el8_0 |
gnutls-dane-debuginfo Red Hat:rhel_e4s:8.0::baseos | All versions | 0:3.6.5-3.el8_0 |
gnutls-debuginfo Red Hat:rhel_e4s:8.0::baseos | All versions | 0:3.6.5-3.el8_0 |
gnutls-debugsource Red Hat:rhel_e4s:8.0::baseos | All versions | 0:3.6.5-3.el8_0 |
gnutls-utils-debuginfo Red Hat:rhel_e4s:8.0::baseos | All versions | 0:3.6.5-3.el8_0 |
gnutls-c++ Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls-c++-debuginfo Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls-dane Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls-dane-debuginfo Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls-debuginfo Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls-debugsource Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls-devel Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls-utils Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls-utils-debuginfo Red Hat:rhel_eus:8.1::appstream | All versions | 0:3.6.8-9.el8_1 |
gnutls Red Hat:rhel_eus:8.1::baseos | All versions | 0:3.6.8-9.el8_1 |
Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Gnu Gnutls.
How do I fix CVE-2020-13777?
Upgrade to a fixed version.
Is CVE-2020-13777 being exploited?
There is no known exploitation of CVE-2020-13777 in the wild and no public exploit code.
Public exploit code: 3 proofs of concept on GitHub.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as ALPINE-CVE-2020-13777, DEBIAN-CVE-2020-13777, DSA-4697-1, GHSA-cv49-m792-xmjv, JLSEC-2026-518, MGASA-2020-0268 and 7 more.