CVE-2021-27135 Memory corruption in n/a
Critical 9.8
Published
Updated
Check this codebase for CVE-2021-27135 and fix it if it is affected.
What it is: CVE-2021-27135 is a critical memory corruption vulnerability in Debian Debian Linux, published on 10 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-27135 in the wild and no public exploit code.
Affected product: Debian Debian 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-2021-27135/ (Markdown: https://insights.sbomify.com/CVE-2021-27135/index.md)
Remote attackers can execute arbitrary code or cause a denial of service in xterm via crafted UTF-8 sequences.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-27135?
CVE-2021-27135 is a critical memory corruption vulnerability in Debian Debian Linux, published on 10 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.
Which versions are affected by CVE-2021-27135?
It affects 3 products.
Linux distribution packages (40)
xterm AlmaLinux:8 | All versions | 331-1.el8_3.2 |
xterm-resize AlmaLinux:8 | All versions | 331-1.el8_3.2 |
xterm Red Hat:enterprise_linux:7::client | All versions | 0:295-3.el7_9.1 |
xterm-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:295-3.el7_9.1 |
xterm Red Hat:enterprise_linux:7::server | All versions | 0:295-3.el7_9.1 |
xterm-debuginfo Red Hat:enterprise_linux:7::server | All versions | 0:295-3.el7_9.1 |
xterm Red Hat:enterprise_linux:7::workstation | All versions | 0:295-3.el7_9.1 |
xterm-debuginfo Red Hat:enterprise_linux:7::workstation | All versions | 0:295-3.el7_9.1 |
xterm Red Hat:enterprise_linux:8::appstream | All versions | 0:331-1.el8_3.2 |
xterm-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:331-1.el8_3.2 |
xterm-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:331-1.el8_3.2 |
xterm-resize Red Hat:enterprise_linux:8::appstream | All versions | 0:331-1.el8_3.2 |
xterm-resize-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:331-1.el8_3.2 |
xterm Red Hat:rhel_eus:8.1::appstream | All versions | 0:331-1.el8_1.1 |
xterm-debuginfo Red Hat:rhel_eus:8.1::appstream | All versions | 0:331-1.el8_1.1 |
xterm-debugsource Red Hat:rhel_eus:8.1::appstream | All versions | 0:331-1.el8_1.1 |
xterm-resize Red Hat:rhel_eus:8.1::appstream | All versions | 0:331-1.el8_1.1 |
xterm-resize-debuginfo Red Hat:rhel_eus:8.1::appstream | All versions | 0:331-1.el8_1.1 |
xterm Red Hat:rhel_eus:8.2::appstream | All versions | 0:331-1.el8_2.1 |
xterm-debuginfo Red Hat:rhel_eus:8.2::appstream | All versions | 0:331-1.el8_2.1 |
xterm-debugsource Red Hat:rhel_eus:8.2::appstream | All versions | 0:331-1.el8_2.1 |
xterm-resize Red Hat:rhel_eus:8.2::appstream | All versions | 0:331-1.el8_2.1 |
xterm-resize-debuginfo Red Hat:rhel_eus:8.2::appstream | All versions | 0:331-1.el8_2.1 |
xterm Rocky Linux:8 | All versions | 0:331-1.el8_3.2 |
xterm SUSE:Enterprise Storage 6 | All versions | 330-4.3.1 |
xterm SUSE:HPE Helion OpenStack 8 | All versions | 308-5.3.1 |
xterm SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | All versions | 330-4.3.1 |
xterm SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 330-4.3.1 |
xterm SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 330-4.3.1 |
xterm SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 330-4.3.1 |
xterm SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 330-11.3.1 |
xterm SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 330-11.3.1 |
xterm SUSE:Linux Enterprise Point of Sale 11 SP3 | All versions | 238-3.3.1 |
xterm SUSE:Linux Enterprise Server 11 SP4-LTSS | All versions | 238-3.3.1 |
xterm SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 308-5.3.1 |
xterm SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 308-5.3.1 |
xterm SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 308-5.3.1 |
xterm SUSE:Linux Enterprise Server 12 SP4-LTSS | All versions | 308-5.3.1 |
xterm SUSE:Linux Enterprise Server 12 SP5 | All versions | 308-5.3.1 |
xterm SUSE:Linux Enterprise Server 15 SP1-BCL | All versions | 330-4.3.1 |
Products include Debian Debian Linux, Fedoraproject Fedora, Invisible-Island Xterm.
How do I fix CVE-2021-27135?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-27135 being exploited?
There is no known exploitation of CVE-2021-27135 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALSA-2021:0611, AZL-7454, CLSA-2022-1650575983, DEBIAN-CVE-2021-27135, DLA-2558-1, GHSA-3w4p-5chr-2r8f and 15 more.