In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade apache2 | Apr 2, 2018 | Mar 26, 2018 |
| Amazon_linux | — | Upgrade httpd24 | May 4, 2018 | Mar 23, 2018 |
| Apache Httpd | — | Upgrade to the latest version of Apache HTTPD | Mar 26, 2018 | Mar 26, 2018 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Mar 26, 2018 |
| Centos_linux | — | Upgrade httpd-toolsUpgrade mod_sslUpgrade httpd-develUpgrade httpdUpgrade httpd-debuginfoUpgrade httpd-manualUpgrade mod_ldapUpgrade mod_proxy_htmlUpgrade mod_session | Apr 1, 2020 | Mar 26, 2018 |
| Debian | — | Upgrade apache2 | Apr 4, 2018 | Mar 23, 2018 |
| Freebsd | — | Upgrade apache24Upgrade apache22 | Mar 25, 2018 | Mar 24, 2018 |
| Hpux | — | Update hpuxwsAPACHE to the latest version | Mar 28, 2022 | Mar 26, 2018 |
| Huawei Euleros 2_0_sp1 | — | Upgrade httpdUpgrade httpd-toolsUpgrade mod_sslUpgrade httpd-develUpgrade httpd-manual | May 29, 2018 | Mar 26, 2018 |
| Huawei Euleros 2_0_sp2 | — | Upgrade mod_sslUpgrade httpd-manualUpgrade httpd-toolsUpgrade httpd-develUpgrade httpd | May 29, 2018 | Mar 26, 2018 |
| Huawei Euleros 2_0_sp3 | — | Upgrade httpd-toolsUpgrade httpd-manualUpgrade httpdUpgrade mod_sslUpgrade httpd-devel | Jul 3, 2018 | Mar 26, 2018 |
| Ibm Http_server | — | Apply IBM HTTP Server Interim Fix PI95670 | Jun 22, 2018 | Mar 26, 2018 |
| Oracle Solaris | — | Upgrade web/server/apache-24/module/apache-ssl to version 2.4.33-0.175.3.32.0.3.0 on Solaris 11.3Upgrade web/server/apache-24/module/apache-lua to version 2.4.33-0.175.3.32.0.3.0 on Solaris 11.3Upgrade web/server/apache-24/module/apache-ssl-fips-140 to version 2.4.33-0.175.3.32.0.3.0 on Solaris 11.3Upgrade web/server/apache-24 to version 2.4.33-0.175.3.32.0.3.0 on Solaris 11.3Upgrade web/server/apache-24/module/apache-ldap to version 2.4.33-0.175.3.32.0.3.0 on Solaris 11.3Upgrade web/server/apache-24/module/apache-dbd to version 2.4.33-0.175.3.32.0.3.0 on Solaris 11.3 | May 16, 2018 | Mar 26, 2018 |
| Oracle_linux | — | Upgrade httpd-toolsUpgrade httpd-manualUpgrade mod_proxy_htmlUpgrade mod_ldapUpgrade mod_sslUpgrade mod_sessionUpgrade httpdUpgrade httpd-devel | Oct 5, 2022 | Mar 24, 2018 |
| Redhat_linux | — | Upgrade mod_ldapUpgrade mod_proxy_htmlUpgrade httpdUpgrade mod_sessionUpgrade httpd-debuginfoUpgrade httpd-develUpgrade httpd-manualUpgrade mod_sslNo solution existsUpgrade httpd-tools | Apr 1, 2020 | Mar 26, 2018 |
| Suse | — | Upgrade apache2-preforkUpgrade apache2-develUpgrade apache2-example-pagesUpgrade apache2-docUpgrade apache2Upgrade apache2-workerUpgrade apache2-utils | Apr 6, 2018 | Mar 23, 2018 |
| Ubuntu | — | Upgrade apache2-binUpgrade apache2.2-bin | Apr 25, 2018 | Mar 23, 2018 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Mar 26, 2018 |
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