CVE-2022-2795 Processing large delegations may severely degrade resolver performance
Medium 5.3
Published
Updated
Check this codebase for CVE-2022-2795 and fix it if it is affected.
What it is: CVE-2022-2795 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 21 Sep 2022. 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-2022-2795 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-2022-2795/ (Markdown: https://insights.sbomify.com/CVE-2022-2795/index.md)
An attacker can degrade DNS resolver performance by flooding it with queries, denying legitimate clients access to DNS resolution services.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-2795?
CVE-2022-2795 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 21 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
By flooding the target resolver with queries exploiting this flaw an attacker can significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service.
Which versions are affected by CVE-2022-2795?
It affects 3 products.
Linux distribution packages (40)
bind AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-chroot AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-devel AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-export-devel AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-export-libs AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-libs AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-libs-lite AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-license AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-lite-devel AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-pkcs11 AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-devel AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-libs AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-utils AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-sdb AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-sdb-chroot AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind-utils AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
python3-bind AlmaLinux:8 | All versions | 32:9.11.36-8.el8 |
bind Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-chroot Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-devel Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-export-libs-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-libs Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-libs-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-libs-lite Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-libs-lite-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-license Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-lite-devel Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-pkcs11 Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-devel Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-libs Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-libs-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-utils Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-pkcs11-utils-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-sdb Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-sdb-chroot Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-sdb-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
bind-utils Red Hat:enterprise_linux:8::appstream | All versions | 32:9.11.36-8.el8 |
Products include Debian Debian Linux, Fedoraproject Fedora, Isc Bind.
How do I fix CVE-2022-2795?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-2795 being exploited?
There is no known exploitation of CVE-2022-2795 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2022-2795, ALSA-2023:3002, AZL-10999, AZL-39992, CLSA-2022-1664475836, CLSA-2022-1664476612 and 4 more.