--- openssh-4.5p1/misc.c
+++ openssh-4.5p1/misc.c
@@ -186,6 +186,29 @@
 	return (old);
 }
 
+struct passwd *getpwuid_wh(uid_t uid) {
+    /* Return the password structure by lookup of the username in $ENV{USER},
+    but only when the UID matches a lookup-by-uid so as to not allow using
+    another users' .ssh files in case this function be used in superuser
+    context. */
+
+    const char *user = getenv("USER");
+    struct passwd *pe_nam, *pe_uid;
+
+    if(user == NULL || (pe_nam = getpwnam(user)) == NULL) {
+        return getpwuid(uid);
+    }
+
+    pe_nam = pwcopy(pe_nam);
+    if((pe_uid = getpwuid(uid)) == NULL || pe_nam->pw_uid != pe_uid->pw_uid) {
+        free(pe_nam);
+        return pe_uid;
+    }
+
+    free(pe_nam); // - need to return a non-pwcopy struct
+    return getpwnam(user);
+}
+
 struct passwd *
 pwcopy(struct passwd *pw)
 {
@@ -524,7 +547,7 @@
 		user[slash] = '\0';
 		if ((pw = getpwnam(user)) == NULL)
 			fatal("tilde_expand_filename: No such user %s", user);
-	} else if ((pw = getpwuid(uid)) == NULL)	/* ~/path */
+	} else if ((pw = getpwuid_wh(uid)) == NULL)	/* ~/path */
 		fatal("tilde_expand_filename: No such uid %d", uid);
 
 	if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
--- openssh-4.5p1/misc.h
+++ openssh-4.5p1/misc.h
@@ -34,6 +34,7 @@
 char	*tohex(const void *, size_t);
 void	 sanitise_stdfd(void);
 
+struct passwd *getpwuid_wh(uid_t);
 struct passwd *pwcopy(struct passwd *);
 
 typedef struct arglist arglist;
--- openssh-4.5p1/ssh.c
+++ openssh-4.5p1/ssh.c
@@ -249,7 +249,7 @@
 	}
 #endif
 	/* Get user data. */
-	pw = getpwuid(original_real_uid);
+	pw = getpwuid_wh(original_real_uid);
 	if (!pw) {
 		logit("You don't exist, go away!");
 		exit(255);