From 545e322cc8c383ccdfb4ad85a1634c2b719a1adf Mon Sep 17 00:00:00 2001
From: Tim Ruehsen <tim.ruehsen@gmx.de>
Date: Tue, 19 Aug 2014 21:01:28 +0200
Subject: [PATCH] cookies: only use full host matches for hosts used as IP
address
By not detecting and rejecting domain names for partial literal IP
addresses properly when parsing received HTTP cookies, libcurl can be
fooled to both send cookies to wrong sites and to allow arbitrary sites
to set cookies for others.
CVE-2014-3613
Bug: http://curl.haxx.se/docs/adv_20140910A.html
---
lib/cookie.c | 50 ++++++++++++++++++++++++++++++++++++++----------
tests/data/test1105 | 3 +--
tests/data/test31 | 55 +++++++++++++++++++++++++++--------------------------
tests/data/test8 | 3 ++-
4 files changed, 71 insertions(+), 40 deletions(-)
diff --git a/lib/cookie.c b/lib/cookie.c
index 0590643..46904ac 100644
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -93,10 +93,11 @@ Example set of cookies:
#include "curl_memory.h"
#include "share.h"
#include "strtoofft.h"
#include "rawstr.h"
#include "curl_memrchr.h"
+#include "inet_pton.h"
/* The last #include file should be: */
#include "memdebug.h"
static void freecookie(struct Cookie *co)
@@ -317,10 +318,32 @@ static void remove_expired(struct CookieInfo *cookies)
}
co = nx;
}
}
+/*
+ * Return true if the given string is an IP(v4|v6) address.
+ */
+static bool isip(const char *domain)
+{
+ struct in_addr addr;
+#ifdef ENABLE_IPV6
+ struct in6_addr addr6;
+#endif
+
+ if(Curl_inet_pton(AF_INET, domain, &addr)
+#ifdef ENABLE_IPV6
+ || Curl_inet_pton(AF_INET6, domain, &addr6)
+#endif
+ ) {
+ /* domain name given as IP address */
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
/****************************************************************************
*
* Curl_cookie_add()
*
* Add a single cookie line to the cookie keeping object.
@@ -437,28 +460,31 @@ Curl_cookie_add(struct SessionHandle *data,
badcookie = TRUE; /* out of memory bad */
break;
}
}
else if(Curl_raw_equal("domain", name)) {
+ bool is_ip;
+
/* Now, we make sure that our host is within the given domain,
or the given domain is not valid and thus cannot be set. */
if('.' == whatptr[0])
whatptr++; /* ignore preceding dot */
- if(!domain || tailmatch(whatptr, domain)) {
- const char *tailptr=whatptr;
- if(tailptr[0] == '.')
- tailptr++;
- strstore(&co->domain, tailptr); /* don't prefix w/dots
- internally */
+ is_ip = isip(domain ? domain : whatptr);
+
+ if(!domain
+ || (is_ip && !strcmp(whatptr, domain))
+ || (!is_ip && tailmatch(whatptr, domain))) {
+ strstore(&co->domain, whatptr);
if(!co->domain) {
badcookie = TRUE;
break;
}
- co->tailmatch=TRUE; /* we always do that if the domain name was
- given */
+ if(!is_ip)
+ co->tailmatch=TRUE; /* we always do that if the domain name was
+ given */
}
else {
/* we did not get a tailmatch and then the attempted set domain
is not a domain to which the current host belongs. Mark as
bad. */
@@ -966,17 +992,21 @@ struct Cookie *Curl_cookie_getlist(struct CookieInfo *c,
struct Cookie *newco;
struct Cookie *co;
time_t now = time(NULL);
struct Cookie *mainco=NULL;
size_t matches = 0;
+ bool is_ip;
if(!c || !c->cookies)
return NULL; /* no cookie struct or no cookies in the struct */
/* at first, remove expired cookies */
remove_expired(c);
+ /* check if host is an IP(v4|v6) address */
+ is_ip = isip(host);
+
co = c->cookies;
while(co) {
/* only process this cookie if it is not expired or had no expire
date AND that if the cookie requires we're secure we must only
@@ -984,12 +1014,12 @@ struct Cookie *Curl_cookie_getlist(struct CookieInfo *c,
if((!co->expires || (co->expires > now)) &&
(co->secure?secure:TRUE)) {
/* now check if the domain is correct */
if(!co->domain ||
- (co->tailmatch && tailmatch(co->domain, host)) ||
- (!co->tailmatch && Curl_raw_equal(host, co->domain)) ) {
+ (co->tailmatch && !is_ip && tailmatch(co->domain, host)) ||
+ ((!co->tailmatch || is_ip) && Curl_raw_equal(host, co->domain)) ) {
/* the right part of the host matches the domain stuff in the
cookie data */
/* now check the left part of the path with the cookies path
requirement */
diff --git a/tests/data/test1105 b/tests/data/test1105
index 25f194c..9564775 100644
--- a/tests/data/test1105
+++ b/tests/data/test1105
@@ -57,10 +57,9 @@ userid=myname&password=mypassword
# Netscape HTTP Cookie File
# http://curl.haxx.se/docs/http-cookies.html
# This file was generated by libcurl! Edit at your own risk.
127.0.0.1 FALSE /we/want/ FALSE 0 foobar name
-.127.0.0.1 TRUE "/silly/" FALSE 0 mismatch this
-.0.0.1 TRUE / FALSE 0 partmatch present
+127.0.0.1 FALSE "/silly/" FALSE 0 mismatch this
</file>
</verify>
</testcase>
diff --git a/tests/data/test31 b/tests/data/test31
index 38af83b..dfcac04 100644
--- a/tests/data/test31
+++ b/tests/data/test31
@@ -49,11 +49,12 @@ Set-Cookie: nodomainnovalue
Set-Cookie: nodomain=value; expires=Fri Feb 2 11:56:27 GMT 2035
Set-Cookie: novalue; domain=reallysilly
Set-Cookie: test=yes; domain=foo.com; expires=Sat Feb 2 11:56:27 GMT 2030
Set-Cookie: test2=yes; domain=se; expires=Sat Feb 2 11:56:27 GMT 2030
Set-Cookie: magic=yessir; path=/silly/; HttpOnly
-Set-Cookie: blexp=yesyes; domain=.0.0.1; domain=.0.0.1; expiry=totally bad;
+Set-Cookie: blexp=yesyes; domain=127.0.0.1; domain=127.0.0.1; expiry=totally bad;
+Set-Cookie: partialip=nono; domain=.0.0.1;
boo
</data>
</reply>
@@ -93,36 +94,36 @@ Accept: */*
<file name="log/jar31.txt" mode="text">
# Netscape HTTP Cookie File
# http://curl.haxx.se/docs/http-cookies.html
# This file was generated by libcurl! Edit at your own risk.
-.127.0.0.1 TRUE /silly/ FALSE 0 ismatch this
-.127.0.0.1 TRUE /overwrite FALSE 0 overwrite this2
-.127.0.0.1 TRUE /secure1/ TRUE 0 sec1value secure1
-.127.0.0.1 TRUE /secure2/ TRUE 0 sec2value secure2
-.127.0.0.1 TRUE /secure3/ TRUE 0 sec3value secure3
-.127.0.0.1 TRUE /secure4/ TRUE 0 sec4value secure4
-.127.0.0.1 TRUE /secure5/ TRUE 0 sec5value secure5
-.127.0.0.1 TRUE /secure6/ TRUE 0 sec6value secure6
-.127.0.0.1 TRUE /secure7/ TRUE 0 sec7value secure7
-.127.0.0.1 TRUE /secure8/ TRUE 0 sec8value secure8
-.127.0.0.1 TRUE /secure9/ TRUE 0 secure very1
-#HttpOnly_.127.0.0.1 TRUE /p1/ FALSE 0 httpo1 value1
-#HttpOnly_.127.0.0.1 TRUE /p2/ FALSE 0 httpo2 value2
-#HttpOnly_.127.0.0.1 TRUE /p3/ FALSE 0 httpo3 value3
-#HttpOnly_.127.0.0.1 TRUE /p4/ FALSE 0 httpo4 value4
-#HttpOnly_.127.0.0.1 TRUE /p4/ FALSE 0 httponly myvalue1
-#HttpOnly_.127.0.0.1 TRUE /p4/ TRUE 0 httpandsec myvalue2
-#HttpOnly_.127.0.0.1 TRUE /p4/ TRUE 0 httpandsec2 myvalue3
-#HttpOnly_.127.0.0.1 TRUE /p4/ TRUE 0 httpandsec3 myvalue4
-#HttpOnly_.127.0.0.1 TRUE /p4/ TRUE 0 httpandsec4 myvalue5
-#HttpOnly_.127.0.0.1 TRUE /p4/ TRUE 0 httpandsec5 myvalue6
-#HttpOnly_.127.0.0.1 TRUE /p4/ TRUE 0 httpandsec6 myvalue7
-#HttpOnly_.127.0.0.1 TRUE /p4/ TRUE 0 httpandsec7 myvalue8
-#HttpOnly_.127.0.0.1 TRUE /p4/ TRUE 0 httpandsec8 myvalue9
-.127.0.0.1 TRUE / FALSE 0 partmatch present
+127.0.0.1 FALSE /silly/ FALSE 0 ismatch this
+127.0.0.1 FALSE /overwrite FALSE 0 overwrite this2
+127.0.0.1 FALSE /secure1/ TRUE 0 sec1value secure1
+127.0.0.1 FALSE /secure2/ TRUE 0 sec2value secure2
+127.0.0.1 FALSE /secure3/ TRUE 0 sec3value secure3
+127.0.0.1 FALSE /secure4/ TRUE 0 sec4value secure4
+127.0.0.1 FALSE /secure5/ TRUE 0 sec5value secure5
+127.0.0.1 FALSE /secure6/ TRUE 0 sec6value secure6
+127.0.0.1 FALSE /secure7/ TRUE 0 sec7value secure7
+127.0.0.1 FALSE /secure8/ TRUE 0 sec8value secure8
+127.0.0.1 FALSE /secure9/ TRUE 0 secure very1
+#HttpOnly_127.0.0.1 FALSE /p1/ FALSE 0 httpo1 value1
+#HttpOnly_127.0.0.1 FALSE /p2/ FALSE 0 httpo2 value2
+#HttpOnly_127.0.0.1 FALSE /p3/ FALSE 0 httpo3 value3
+#HttpOnly_127.0.0.1 FALSE /p4/ FALSE 0 httpo4 value4
+#HttpOnly_127.0.0.1 FALSE /p4/ FALSE 0 httponly myvalue1
+#HttpOnly_127.0.0.1 FALSE /p4/ TRUE 0 httpandsec myvalue2
+#HttpOnly_127.0.0.1 FALSE /p4/ TRUE 0 httpandsec2 myvalue3
+#HttpOnly_127.0.0.1 FALSE /p4/ TRUE 0 httpandsec3 myvalue4
+#HttpOnly_127.0.0.1 FALSE /p4/ TRUE 0 httpandsec4 myvalue5
+#HttpOnly_127.0.0.1 FALSE /p4/ TRUE 0 httpandsec5 myvalue6
+#HttpOnly_127.0.0.1 FALSE /p4/ TRUE 0 httpandsec6 myvalue7
+#HttpOnly_127.0.0.1 FALSE /p4/ TRUE 0 httpandsec7 myvalue8
+#HttpOnly_127.0.0.1 FALSE /p4/ TRUE 0 httpandsec8 myvalue9
+127.0.0.1 FALSE / FALSE 0 partmatch present
127.0.0.1 FALSE /we/want/ FALSE 2054030187 nodomain value
#HttpOnly_127.0.0.1 FALSE /silly/ FALSE 0 magic yessir
-.0.0.1 TRUE /we/want/ FALSE 0 blexp yesyes
+127.0.0.1 FALSE /we/want/ FALSE 0 blexp yesyes
</file>
</verify>
</testcase>
diff --git a/tests/data/test8 b/tests/data/test8
index 4d54541..030fd55 100644
--- a/tests/data/test8
+++ b/tests/data/test8
@@ -40,11 +40,12 @@ Set-Cookie: mismatch=this; domain=%HOSTIP; path="/silly/";
Set-Cookie: partmatch=present; domain=.0.0.1; path=/w;
Set-Cookie: duplicate=test; domain=.0.0.1; domain=.0.0.1; path=/donkey;
Set-Cookie: cookie=yes; path=/we;
Set-Cookie: cookie=perhaps; path=/we/want;
Set-Cookie: nocookie=yes; path=/WE;
-Set-Cookie: blexp=yesyes; domain=.0.0.1; domain=.0.0.1; expiry=totally bad;
+Set-Cookie: blexp=yesyes; domain=%HOSTIP; domain=%HOSTIP; expiry=totally bad;
+Set-Cookie: partialip=nono; domain=.0.0.1;
</file>
<precheck>
perl -e 'if ("%HOSTIP" !~ /\.0\.0\.1$/) {print "Test only works for HOSTIPs ending with .0.0.1"; exit(1)}'
</precheck>
--
2.1.0
