# CVE-2019-14907: Denial of service in samba > Attackers can crash long-lived Samba AD DC processes by sending crafted NTLMSSP strings when high log levels are enabled. - **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 21 Jan 2020 - **Updated:** 5 Aug 2024 - **Also known as:** ALPINE-CVE-2019-14907, DEBIAN-CVE-2019-14907, ECHO-c032-e81f-5ad9, GHSA-qw9p-wf2h-j96q, RHSA-2020:3981, SUSE-SU-2020:0152-1, SUSE-SU-2020:0233-1, UBUNTU-CVE-2019-14907 ## What is CVE-2019-14907? CVE-2019-14907 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 21 Jan 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange. In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a crash there is harmless). Weakness: CWE-125 (Out-of-bounds Read) ## Which versions are affected by CVE-2019-14907? It affects 10 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libsmbclient` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `libsmbclient-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `libwbclient` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `libwbclient-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-client` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-client-libs` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-common` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-common-libs` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-common-tools` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-dc` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-dc-libs` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-krb5-printing` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-libs` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-pidl` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-python` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-python-test` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-test` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-test-libs` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-vfs-glusterfs` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-winbind` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-winbind-clients` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-winbind-krb5-locator` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `samba-winbind-modules` | Red Hat:enterprise_linux:7::client | All versions | 0:4.10.16-5.el7 | | `libsmbclient` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `libsmbclient-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `libwbclient` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `libwbclient-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-client` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-client-libs` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-common` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-common-libs` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-common-tools` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-dc` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-dc-libs` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-debuginfo` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | | `samba-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:4.10.16-5.el7 | Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Redhat Enterprise Linux, Redhat Storage, Samba Samba, Synology Directory Server, Synology Diskstation Manager, Synology Router Manager, Synology Skynas. ## How do I fix CVE-2019-14907? Upgrade to a fixed version. ## Is CVE-2019-14907 being exploited? There is no known exploitation of CVE-2019-14907 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-2019-14907 and fix it if it is affected. What it is: CVE-2019-14907 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 21 Jan 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2019-14907 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-2019-14907/ (Markdown: https://insights.sbomify.com/CVE-2019-14907/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-14907 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-14907 - OSV: https://osv.dev/vulnerability/CVE-2019-14907 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-14907/ Summaries are generated and may contain mistakes; the official description above is the record.