[openssh-commits] [openssh] 02/02: ignore PAM environment vars when UseLogin=yes

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Wed Apr 13 10:44:28 AEST 2016

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djm pushed a commit to branch master
in repository openssh.

commit 3b54a8fe53711c494286c073bc033f98edeaddc4
Author: Damien Miller <djm at mindrot.org>
Date:   Wed Apr 13 10:39:57 2016 +1000

    ignore PAM environment vars when UseLogin=yes
    If PAM is configured to read user-specified environment variables
    and UseLogin=yes in sshd_config, then a hostile local user may
    attack /bin/login via LD_PRELOAD or similar environment variables
    set via PAM.
    CVE-2015-8325, found by Shayan S, via Colin Watson
 session.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/session.c b/session.c
index 4859245..4653b09 100644
--- a/session.c
+++ b/session.c
@@ -1322,7 +1322,7 @@ do_setup_env(Session *s, const char *shell)
 	 * Pull in any environment variables that may have
 	 * been set by PAM.
-	if (options.use_pam) {
+	if (options.use_pam && !options.use_login) {
 		char **p;
 		p = fetch_pam_child_environment();

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