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Gentoo Linux Security Advisory GLSA 200507-13 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: pam_ldap and nss_ldap: Plain text authentication leak |
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Date: July 14, 2005 |
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Bugs: #96767 |
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ID: 200507-13 |
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Synopsis |
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======== |
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|
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pam_ldap and nss_ldap fail to restart TLS when following a referral, |
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possibly leading to credentials being sent in plain text. |
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|
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Background |
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========== |
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|
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pam_ldap is a Pluggable Authentication Module which allows |
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authentication against an LDAP directory. nss_ldap is a Name Service |
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Switch module which allows 'passwd', 'group' and 'host' database |
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information to be pulled from LDAP. TLS is Transport Layer Security, a |
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protocol that allows encryption of network communications. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 sys-auth/nss_ldap < 239-r1 >= 239-r1 |
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*>= 226-r1 |
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2 sys-auth/pam_ldap < 178-r1 >= 178-r1 |
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------------------------------------------------------------------- |
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2 affected packages on all of their supported architectures. |
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------------------------------------------------------------------- |
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|
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Description |
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=========== |
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|
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Rob Holland of the Gentoo Security Audit Team discovered that pam_ldap |
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and nss_ldap fail to use TLS for referred connections if they are |
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referred to a master after connecting to a slave, regardless of the |
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"ssl start_tls" ldap.conf setting. |
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|
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Impact |
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====== |
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|
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An attacker could sniff passwords or other sensitive information as the |
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communication is not encrypted. |
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Workaround |
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========== |
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|
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pam_ldap and nss_ldap can be set to force the use of SSL instead of |
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TLS. |
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Resolution |
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========== |
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All pam_ldap users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-178-r1" |
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All nss_ldap users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose sys-auth/nss_ldap |
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|
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References |
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========== |
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|
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[ 1 ] CAN-2005-2069 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2069 |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200507-13.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2005 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.0 |
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