# CVE-2018-1312: Security feature bypass in Apache HTTP Server > Attackers can replay HTTP requests across clustered servers using weak Digest authentication nonces, bypassing anti-replay protections. - **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 26 Mar 2018 - **Updated:** 16 Sep 2024 - **Also known as:** ALPINE-CVE-2018-1312, CLEANSTART-2026-QH33637, DEBIAN-CVE-2018-1312, GHSA-hvff-4fq3-p325, RHSA-2019:1898, UBUNTU-CVE-2018-1312 ## What is CVE-2018-1312? CVE-2018-1312 is a critical vulnerability in Apache Http Server, published on 26 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description In Apache httpd 2.2.0 to 2.4.29, when generating an HTTP Digest authentication challenge, the nonce sent to prevent reply attacks was not correctly generated using a pseudo-random seed. In a cluster of servers using a common Digest authentication configuration, HTTP requests could be replayed across servers by an attacker without detection. Weakness: CWE-287 (Improper Authentication) ## Which versions are affected by CVE-2018-1312? It affects 13 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `httpd` | Red Hat:enterprise_linux:7::client | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-manual` | Red Hat:enterprise_linux:7::client | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-tools` | Red Hat:enterprise_linux:7::client | All versions | 0:2.4.6-89.el7_6.1 | | `mod_ldap` | Red Hat:enterprise_linux:7::client | All versions | 0:2.4.6-89.el7_6.1 | | `mod_proxy_html` | Red Hat:enterprise_linux:7::client | All versions | 1:2.4.6-89.el7_6.1 | | `mod_session` | Red Hat:enterprise_linux:7::client | All versions | 0:2.4.6-89.el7_6.1 | | `mod_ssl` | Red Hat:enterprise_linux:7::client | All versions | 1:2.4.6-89.el7_6.1 | | `httpd` | Red Hat:enterprise_linux:7::computenode | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-debuginfo` | Red Hat:enterprise_linux:7::computenode | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-manual` | Red Hat:enterprise_linux:7::computenode | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-tools` | Red Hat:enterprise_linux:7::computenode | All versions | 0:2.4.6-89.el7_6.1 | | `mod_ldap` | Red Hat:enterprise_linux:7::computenode | All versions | 0:2.4.6-89.el7_6.1 | | `mod_proxy_html` | Red Hat:enterprise_linux:7::computenode | All versions | 1:2.4.6-89.el7_6.1 | | `mod_session` | Red Hat:enterprise_linux:7::computenode | All versions | 0:2.4.6-89.el7_6.1 | | `mod_ssl` | Red Hat:enterprise_linux:7::computenode | All versions | 1:2.4.6-89.el7_6.1 | | `httpd` | Red Hat:enterprise_linux:7::server | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-manual` | Red Hat:enterprise_linux:7::server | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-tools` | Red Hat:enterprise_linux:7::server | All versions | 0:2.4.6-89.el7_6.1 | | `mod_ldap` | Red Hat:enterprise_linux:7::server | All versions | 0:2.4.6-89.el7_6.1 | | `mod_proxy_html` | Red Hat:enterprise_linux:7::server | All versions | 1:2.4.6-89.el7_6.1 | | `mod_session` | Red Hat:enterprise_linux:7::server | All versions | 0:2.4.6-89.el7_6.1 | | `mod_ssl` | Red Hat:enterprise_linux:7::server | All versions | 1:2.4.6-89.el7_6.1 | | `httpd` | Red Hat:enterprise_linux:7::workstation | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-manual` | Red Hat:enterprise_linux:7::workstation | All versions | 0:2.4.6-89.el7_6.1 | | `httpd-tools` | Red Hat:enterprise_linux:7::workstation | All versions | 0:2.4.6-89.el7_6.1 | | `mod_ldap` | Red Hat:enterprise_linux:7::workstation | All versions | 0:2.4.6-89.el7_6.1 | | `mod_proxy_html` | Red Hat:enterprise_linux:7::workstation | All versions | 1:2.4.6-89.el7_6.1 | | `mod_session` | Red Hat:enterprise_linux:7::workstation | All versions | 0:2.4.6-89.el7_6.1 | | `mod_ssl` | Red Hat:enterprise_linux:7::workstation | All versions | 1:2.4.6-89.el7_6.1 | Products: Apache Http Server, Canonical Ubuntu Linux, Debian Debian Linux, Netapp Cloud Backup, Netapp Clustered Data Ontap, Netapp Storagegrid, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Tus, Redhat Enterprise Linux Workstation, Redhat Jboss Core Services. ## How do I fix CVE-2018-1312? Upgrade to a fixed version. ## Is CVE-2018-1312 being exploited? There is no known exploitation of CVE-2018-1312 in the wild and no public exploit code. ## Other vulnerabilities in Apache Http Server - [CVE-2021-42013](https://insights.sbomify.com/CVE-2021-42013/): Apache HTTP Server Path Traversal (critical 9.8, exploited in the wild) - [CVE-2024-38475](https://insights.sbomify.com/CVE-2024-38475/): Apache HTTP Server Improper Escaping of Output (critical 9.1, exploited in the wild) - [CVE-2021-40438](https://insights.sbomify.com/CVE-2021-40438/): Apache HTTP Server-Side Request Forgery (SSRF) (critical 9.0, exploited in the wild) - [CVE-2019-0211](https://insights.sbomify.com/CVE-2019-0211/): Apache HTTP Server Privilege Escalation (high 7.8, exploited in the wild) - [CVE-2021-41773](https://insights.sbomify.com/CVE-2021-41773/): Apache HTTP Server Path Traversal (high 7.5, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2018-1312 and fix it if it is affected. What it is: CVE-2018-1312 is a critical vulnerability in Apache Http Server, published on 26 Mar 2018. 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-2018-1312 in the wild and no public exploit code. Affected product: Apache Http Server. 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-2018-1312/ (Markdown: https://insights.sbomify.com/CVE-2018-1312/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1312 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1312 - OSV: https://osv.dev/vulnerability/CVE-2018-1312 --- From sbomify Insights: https://insights.sbomify.com/CVE-2018-1312/ Summaries are generated and may contain mistakes; the official description above is the record.