CVE-2017-11501

NixOS 17.03 and earlier has an unintended default absence of SSL Certificate Validation for LDAP. The users.ldap NixOS module implements user authentication against LDAP servers via a PAM module. It was found that if TLS is enabled to connect to the LDAP server with users.ldap.useTLS, peer verification will be unconditionally disabled in /etc/ldap.conf.

• CWE-295

• http://openwall.com/lists/oss-security/2017/07/20/1Mailing List, Mitigation, Patch, Third Party Advisory
• https://github.com/NixOS/nixpkgs/issues/27506Issue Tracking, Third Party Advisory
• https://groups.google.com/forum/#%21topic/nix-security-announce/qrDU0KH_ZRk
• http://openwall.com/lists/oss-security/2017/07/20/1Mailing List, Mitigation, Patch, Third Party Advisory
• https://github.com/NixOS/nixpkgs/issues/27506Issue Tracking, Third Party Advisory
• https://groups.google.com/forum/#%21topic/nix-security-announce/qrDU0KH_ZRk

Published

Jul 20, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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