# CVE-2018-1050: Null dereference in Samba > Attackers can crash the print spooler service via RPC calls when configured as an external daemon, causing denial of service. - **Severity:** Medium 4.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 13 Mar 2018 - **Updated:** 16 Sep 2024 - **Also known as:** ALPINE-CVE-2018-1050, AZL-7345, DEBIAN-CVE-2018-1050, DLA-1320-1, ECHO-107f-d080-18f1, GHSA-mfgj-gxgx-gcc4, RHSA-2018:1860, RHSA-2018:1883, SUSE-SU-2018:0754-1, SUSE-SU-2018:0774-1, SUSE-SU-2018:0832-1, UBUNTU-CVE-2018-1050 ## What is CVE-2018-1050? CVE-2018-1050 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 13 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description All versions of Samba from 4.0.0 onwards are vulnerable to a denial of service attack when the RPC spoolss service is configured to be run as an external daemon. Missing input sanitization checks on some of the input parameters to spoolss RPC calls could cause the print spooler service to crash. Weakness: CWE-476 (NULL Pointer Dereference) ## Which versions are affected by CVE-2018-1050? It affects 6 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libsmbclient` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `libsmbclient-devel` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-client` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-common` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-debuginfo` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-doc` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-domainjoin-gui` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-glusterfs` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-swat` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-winbind` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-winbind-clients` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-winbind-devel` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba-winbind-krb5-locator` | Red Hat:enterprise_linux:6::client | All versions | 0:3.6.23-51.el6 | | `samba4` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-client` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-common` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-dc` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-dc-libs` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-debuginfo` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-devel` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-libs` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-pidl` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-python` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-test` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-winbind` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-winbind-clients` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `samba4-winbind-krb5-locator` | Red Hat:enterprise_linux:6::client | All versions | 0:4.2.10-15.el6 | | `libsmbclient` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `libsmbclient-devel` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-client` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-common` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-debuginfo` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-doc` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-domainjoin-gui` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-glusterfs` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-swat` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-winbind` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | | `samba-winbind-clients` | Red Hat:enterprise_linux:6::computenode | All versions | 0:3.6.23-51.el6 | Products: Canonical Ubuntu Linux, Debian Debian Linux, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation, Samba Samba. ## How do I fix CVE-2018-1050? Apply the vendor's patch. ## Is CVE-2018-1050 being exploited? There is no known exploitation of CVE-2018-1050 in the wild and no public exploit code. ## Other vulnerabilities in Canonical Ubuntu Linux - [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild) - [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2018-1050 and fix it if it is affected. What it is: CVE-2018-1050 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 13 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2018-1050 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-2018-1050/ (Markdown: https://insights.sbomify.com/CVE-2018-1050/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1050 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1050 - OSV: https://osv.dev/vulnerability/CVE-2018-1050 --- From sbomify Insights: https://insights.sbomify.com/CVE-2018-1050/ Summaries are generated and may contain mistakes; the official description above is the record.