CVE-2016-2774 Denial of service in n/a
Medium 5.9
Published
Updated
Check this codebase for CVE-2016-2774 and fix it if it is affected.
What it is: CVE-2016-2774 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 9 Mar 2016. 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-2016-2774 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-2016-2774/ (Markdown: https://insights.sbomify.com/CVE-2016-2774/index.md)
Remote attackers can cause a denial of service in ISC DHCP by establishing excessive concurrent TCP sessions, leading to assertion failures or outages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-2774?
CVE-2016-2774 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 9 Mar 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.
Weakness: CWE-20
Which versions are affected by CVE-2016-2774?
It affects 3 products.
Linux distribution packages (40)
dhclient Red Hat:enterprise_linux:7::client | All versions | 12:4.2.5-47.el7 |
dhcp Red Hat:enterprise_linux:7::client | All versions | 12:4.2.5-47.el7 |
dhcp-common Red Hat:enterprise_linux:7::client | All versions | 12:4.2.5-47.el7 |
dhcp-debuginfo Red Hat:enterprise_linux:7::client | All versions | 12:4.2.5-47.el7 |
dhcp-devel Red Hat:enterprise_linux:7::client | All versions | 12:4.2.5-47.el7 |
dhcp-libs Red Hat:enterprise_linux:7::client | All versions | 12:4.2.5-47.el7 |
dhclient Red Hat:enterprise_linux:7::computenode | All versions | 12:4.2.5-47.el7 |
dhcp Red Hat:enterprise_linux:7::computenode | All versions | 12:4.2.5-47.el7 |
dhcp-common Red Hat:enterprise_linux:7::computenode | All versions | 12:4.2.5-47.el7 |
dhcp-debuginfo Red Hat:enterprise_linux:7::computenode | All versions | 12:4.2.5-47.el7 |
dhcp-devel Red Hat:enterprise_linux:7::computenode | All versions | 12:4.2.5-47.el7 |
dhcp-libs Red Hat:enterprise_linux:7::computenode | All versions | 12:4.2.5-47.el7 |
dhclient Red Hat:enterprise_linux:7::server | All versions | 12:4.2.5-47.el7 |
dhcp Red Hat:enterprise_linux:7::server | All versions | 12:4.2.5-47.el7 |
dhcp-common Red Hat:enterprise_linux:7::server | All versions | 12:4.2.5-47.el7 |
dhcp-debuginfo Red Hat:enterprise_linux:7::server | All versions | 12:4.2.5-47.el7 |
dhcp-devel Red Hat:enterprise_linux:7::server | All versions | 12:4.2.5-47.el7 |
dhcp-libs Red Hat:enterprise_linux:7::server | All versions | 12:4.2.5-47.el7 |
dhclient Red Hat:enterprise_linux:7::workstation | All versions | 12:4.2.5-47.el7 |
dhcp Red Hat:enterprise_linux:7::workstation | All versions | 12:4.2.5-47.el7 |
dhcp-common Red Hat:enterprise_linux:7::workstation | All versions | 12:4.2.5-47.el7 |
dhcp-debuginfo Red Hat:enterprise_linux:7::workstation | All versions | 12:4.2.5-47.el7 |
dhcp-devel Red Hat:enterprise_linux:7::workstation | All versions | 12:4.2.5-47.el7 |
dhcp-libs Red Hat:enterprise_linux:7::workstation | All versions | 12:4.2.5-47.el7 |
dhcp SUSE:Linux Enterprise Desktop 12 | All versions | 4.2.6-14.6.1 |
dhcp SUSE:Linux Enterprise Desktop 12 SP1 | All versions | 4.3.3-9.1 |
dhcp SUSE:Linux Enterprise Point of Sale 11 SP3 | All versions | 4.2.4.P2-0.27.1 |
dhcp SUSE:Linux Enterprise Server 11 SP2-LTSS | All versions | 4.2.4.P2-0.11.15.1 |
dhcp SUSE:Linux Enterprise Server 11 SP3-LTSS | All versions | 4.2.4.P2-0.27.1 |
dhcp SUSE:Linux Enterprise Server 11 SP3-TERADATA | All versions | 4.2.4.P2-0.27.1 |
dhcp SUSE:Linux Enterprise Server 11 SP4 | All versions | 4.2.4.P2-0.27.1 |
dhcp SUSE:Linux Enterprise Server 12 | All versions | 4.2.6-14.6.1 |
dhcp SUSE:Linux Enterprise Server 12 SP1 | All versions | 4.3.3-9.1 |
dhcp SUSE:Linux Enterprise Server for SAP Applications 11 SP4 | All versions | 4.2.4.P2-0.27.1 |
dhcp SUSE:Linux Enterprise Server for SAP Applications 12 | All versions | 4.2.6-14.6.1 |
dhcp SUSE:Linux Enterprise Server for SAP Applications 12 SP1 | All versions | 4.3.3-9.1 |
dhcp SUSE:Linux Enterprise Software Development Kit 11 SP4 | All versions | 4.2.4.P2-0.27.1 |
dhcp SUSE:Linux Enterprise Software Development Kit 12 | All versions | 4.2.6-14.6.1 |
dhcp SUSE:Linux Enterprise Software Development Kit 12 SP1 | All versions | 4.3.3-9.1 |
dhcp SUSE:Manager 2.1 | All versions | 4.2.4.P2-0.27.1 |
Products include Canonical Ubuntu Linux, Debian Debian Linux, Isc Dhcp.
How do I fix CVE-2016-2774?
Upgrade to a fixed version.
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-2016-2774 being exploited?
There is no known exploitation of CVE-2016-2774 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2016-2774, DLA-2003-1, GHSA-rg7r-5jqm-6r7j, RHSA-2016:2590, SUSE-SU-2016:1692-1, SUSE-SU-2016:1735-1 and 3 more.