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diff -up pam/modules/pam_env/pam_env.c.nouserenv pam/modules/pam_env/pam_env.c
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--- pam/modules/pam_env/pam_env.c.nouserenv	2010-10-20 09:59:30.000000000 +0200
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+++ pam/modules/pam_env/pam_env.c	2010-11-01 14:42:01.000000000 +0100
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@@ -10,7 +10,7 @@
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 #define DEFAULT_READ_ENVFILE    1
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 #define DEFAULT_USER_ENVFILE    ".pam_environment"
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-#define DEFAULT_USER_READ_ENVFILE 1
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+#define DEFAULT_USER_READ_ENVFILE 0
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 #include "config.h"
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diff -up pam/modules/pam_env/pam_env.8.xml.nouserenv pam/modules/pam_env/pam_env.8.xml
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--- pam/modules/pam_env/pam_env.8.xml.nouserenv	2010-10-20 09:59:30.000000000 +0200
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+++ pam/modules/pam_env/pam_env.8.xml	2010-11-01 14:42:01.000000000 +0100
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@@ -147,7 +147,10 @@
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         <listitem>
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           <para>
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             Turns on or off the reading of the user specific environment
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-            file. 0 is off, 1 is on. By default this option is on.
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+            file. 0 is off, 1 is on. By default this option is off as user
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+            supplied environment variables in the PAM environment could affect
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+            behavior of subsequent modules in the stack without the consent
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+            of the system administrator.
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           </para>
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         </listitem>
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       </varlistentry>