From 46b570a1e4aeb4a414898fcc09503ac388d16256 Mon Sep 17 00:00:00 2001 From: Niels Dossche <7771979+nielsdos@users.noreply.github.com> Date: Sun, 17 Mar 2024 21:04:47 +0100 Subject: [PATCH 1/4] Fix GHSA-wpj3-hf5j-x4v4: __Host-/__Secure- cookie bypass due to partial CVE-2022-31629 fix The check happened too early as later code paths may perform more mangling rules. Move the check downwards right before adding the actual variable. (cherry picked from commit 093c08af25fb323efa0c8e6154aa9fdeae3d3b53) (cherry picked from commit 2e07a3acd7a6b53c55325b94bed97748d7697b53) (cherry picked from commit a6c1c62a25ac23b08a86af11d68f0e2eaafc102b) --- ext/standard/tests/ghsa-wpj3-hf5j-x4v4.phpt | 63 +++++++++++++++++++++ main/php_variables.c | 41 +++++++++----- 2 files changed, 90 insertions(+), 14 deletions(-) create mode 100644 ext/standard/tests/ghsa-wpj3-hf5j-x4v4.phpt diff --git a/ext/standard/tests/ghsa-wpj3-hf5j-x4v4.phpt b/ext/standard/tests/ghsa-wpj3-hf5j-x4v4.phpt new file mode 100644 index 0000000000..77fcb68089 --- /dev/null +++ b/ext/standard/tests/ghsa-wpj3-hf5j-x4v4.phpt @@ -0,0 +1,63 @@ +--TEST-- +ghsa-wpj3-hf5j-x4v4 (__Host-/__Secure- cookie bypass due to partial CVE-2022-31629 fix) +--COOKIE-- +..Host-test=ignore_1; +._Host-test=ignore_2; +.[Host-test=ignore_3; +_.Host-test=ignore_4; +__Host-test=ignore_5; +_[Host-test=ignore_6; +[.Host-test=ignore_7; +[_Host-test=ignore_8; +[[Host-test=ignore_9; +..Host-test[]=ignore_10; +._Host-test[]=ignore_11; +.[Host-test[]=ignore_12; +_.Host-test[]=ignore_13; +__Host-test[]=legitimate_14; +_[Host-test[]=legitimate_15; +[.Host-test[]=ignore_16; +[_Host-test[]=ignore_17; +[[Host-test[]=ignore_18; +..Secure-test=ignore_1; +._Secure-test=ignore_2; +.[Secure-test=ignore_3; +_.Secure-test=ignore_4; +__Secure-test=ignore_5; +_[Secure-test=ignore_6; +[.Secure-test=ignore_7; +[_Secure-test=ignore_8; +[[Secure-test=ignore_9; +..Secure-test[]=ignore_10; +._Secure-test[]=ignore_11; +.[Secure-test[]=ignore_12; +_.Secure-test[]=ignore_13; +__Secure-test[]=legitimate_14; +_[Secure-test[]=legitimate_15; +[.Secure-test[]=ignore_16; +[_Secure-test[]=ignore_17; +[[Secure-test[]=ignore_18; +--FILE-- + +--EXPECT-- +array(3) { + ["__Host-test"]=> + array(1) { + [0]=> + string(13) "legitimate_14" + } + ["_"]=> + array(2) { + ["Host-test["]=> + string(13) "legitimate_15" + ["Secure-test["]=> + string(13) "legitimate_15" + } + ["__Secure-test"]=> + array(1) { + [0]=> + string(13) "legitimate_14" + } +} diff --git a/main/php_variables.c b/main/php_variables.c index f2d0c3bd98..d0ebd50ec8 100644 --- a/main/php_variables.c +++ b/main/php_variables.c @@ -65,6 +65,21 @@ static zend_always_inline void php_register_variable_quick(const char *name, siz zend_string_release_ex(key, 0); } +/* Discard variable if mangling made it start with __Host-, where pre-mangling it did not start with __Host- + * Discard variable if mangling made it start with __Secure-, where pre-mangling it did not start with __Secure- */ +static zend_bool php_is_forbidden_variable_name(const char *mangled_name, size_t mangled_name_len, const char *pre_mangled_name) +{ + if (mangled_name_len >= sizeof("__Host-")-1 && strncmp(mangled_name, "__Host-", sizeof("__Host-")-1) == 0 && strncmp(pre_mangled_name, "__Host-", sizeof("__Host-")-1) != 0) { + return 1; + } + + if (mangled_name_len >= sizeof("__Secure-")-1 && strncmp(mangled_name, "__Secure-", sizeof("__Secure-")-1) == 0 && strncmp(pre_mangled_name, "__Secure-", sizeof("__Secure-")-1) != 0) { + return 1; + } + + return 0; +} + PHPAPI void php_register_variable_ex(char *var_name, zval *val, zval *track_vars_array) { char *p = NULL; @@ -115,20 +130,6 @@ PHPAPI void php_register_variable_ex(char *var_name, zval *val, zval *track_vars } var_len = p - var; - /* Discard variable if mangling made it start with __Host-, where pre-mangling it did not start with __Host- */ - if (strncmp(var, "__Host-", sizeof("__Host-")-1) == 0 && strncmp(var_name, "__Host-", sizeof("__Host-")-1) != 0) { - zval_ptr_dtor_nogc(val); - free_alloca(var_orig, use_heap); - return; - } - - /* Discard variable if mangling made it start with __Secure-, where pre-mangling it did not start with __Secure- */ - if (strncmp(var, "__Secure-", sizeof("__Secure-")-1) == 0 && strncmp(var_name, "__Secure-", sizeof("__Secure-")-1) != 0) { - zval_ptr_dtor_nogc(val); - free_alloca(var_orig, use_heap); - return; - } - if (var_len==0) { /* empty variable name, or variable name with a space in it */ zval_ptr_dtor_nogc(val); free_alloca(var_orig, use_heap); @@ -226,6 +227,12 @@ PHPAPI void php_register_variable_ex(char *var_name, zval *val, zval *track_vars return; } } else { + if (php_is_forbidden_variable_name(index, index_len, var_name)) { + zval_ptr_dtor_nogc(val); + free_alloca(var_orig, use_heap); + return; + } + gpc_element_p = zend_symtable_str_find(symtable1, index, index_len); if (!gpc_element_p) { zval tmp; @@ -263,6 +270,12 @@ plain_var: zval_ptr_dtor_nogc(val); } } else { + if (php_is_forbidden_variable_name(index, index_len, var_name)) { + zval_ptr_dtor_nogc(val); + free_alloca(var_orig, use_heap); + return; + } + zend_ulong idx; /* -- 2.44.0 From 8642473b624f809b768180b104c013f74e3a99a0 Mon Sep 17 00:00:00 2001 From: Remi Collet Date: Wed, 10 Apr 2024 08:59:32 +0200 Subject: [PATCH 2/4] NEWS (cherry picked from commit 366cc249b7d54707572beb7096e8f6c65ee79719) (cherry picked from commit dcdd49ef3bfbd8ccc778850d6a0f9b98adf625d4) --- NEWS | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/NEWS b/NEWS index 05d9ca8f4c..e26f978213 100644 --- a/NEWS +++ b/NEWS @@ -1,6 +1,12 @@ PHP NEWS ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| +Backported from 8.1.28 + +- Standard: + . Fixed bug GHSA-wpj3-hf5j-x4v4 (__Host-/__Secure- cookie bypass due to + partial CVE-2022-31629 fix). (CVE-2024-2756) (nielsdos) + Backported from 8.0.30 - Libxml: -- 2.44.0