From 6c18e8f7dd58cb92c71cb4ea6ce31e5939ea4ff7 Mon Sep 17 00:00:00 2001
From: Max Rees <maxcrees@me.com>
Date: Tue, 3 Mar 2020 14:47:07 +0000
Subject: user/exiv2: patch CVE-2019-20421 (#233)

---
 user/exiv2/CVE-2019-20421.patch | 116 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 user/exiv2/CVE-2019-20421.patch

(limited to 'user/exiv2/CVE-2019-20421.patch')

diff --git a/user/exiv2/CVE-2019-20421.patch b/user/exiv2/CVE-2019-20421.patch
new file mode 100644
index 000000000..bdc5449f2
--- /dev/null
+++ b/user/exiv2/CVE-2019-20421.patch
@@ -0,0 +1,116 @@
+From 1b917c3f7dd86336a9f6fda4456422c419dfe88c Mon Sep 17 00:00:00 2001
+From: clanmills <robin@clanmills.com>
+Date: Tue, 1 Oct 2019 17:39:44 +0100
+Subject: [PATCH] Fix #1011 fix_1011_jp2_readmetadata_loop
+
+---
+ src/jp2image.cpp                             |  25 +++++++++++++++----
+ tests/bugfixes/github/test_CVE_2017_17725.py |   4 +--
+ tests/bugfixes/github/test_issue_1011.py     |  13 ++++++++++
+ 4 files changed, 35 insertions(+), 7 deletions(-)
+ create mode 100755 test/data/Jp2Image_readMetadata_loop.poc
+ create mode 100644 tests/bugfixes/github/test_issue_1011.py
+
+diff --git a/src/jp2image.cpp b/src/jp2image.cpp
+index d5cd1340a..0de088d62 100644
+--- a/src/jp2image.cpp
++++ b/src/jp2image.cpp
+@@ -18,10 +18,6 @@
+  * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
+  */
+ 
+-/*
+-  File:      jp2image.cpp
+-*/
+-
+ // *****************************************************************************
+ 
+ // included header files
+@@ -197,6 +193,16 @@ namespace Exiv2
+         return result;
+     }
+ 
++static void boxes_check(size_t b,size_t m)
++{
++    if ( b > m ) {
++#ifdef EXIV2_DEBUG_MESSAGES
++        std::cout << "Exiv2::Jp2Image::readMetadata box maximum exceeded" << std::endl;
++#endif
++        throw Error(kerCorruptedMetadata);
++    }
++}
++
+     void Jp2Image::readMetadata()
+     {
+ #ifdef EXIV2_DEBUG_MESSAGES
+@@ -219,9 +225,12 @@ namespace Exiv2
+         Jp2BoxHeader      subBox    = {0,0};
+         Jp2ImageHeaderBox ihdr      = {0,0,0,0,0,0,0,0};
+         Jp2UuidBox        uuid      = {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
++        size_t            boxes     = 0 ;
++        size_t            boxem     = 1000 ; // boxes max
+ 
+         while (io_->read((byte*)&box, sizeof(box)) == sizeof(box))
+         {
++            boxes_check(boxes++,boxem );
+             position   = io_->tell();
+             box.length = getLong((byte*)&box.length, bigEndian);
+             box.type   = getLong((byte*)&box.type, bigEndian);
+@@ -251,8 +260,12 @@ namespace Exiv2
+ 
+                     while (io_->read((byte*)&subBox, sizeof(subBox)) == sizeof(subBox) && subBox.length )
+                     {
++                        boxes_check(boxes++, boxem) ;
+                         subBox.length = getLong((byte*)&subBox.length, bigEndian);
+                         subBox.type   = getLong((byte*)&subBox.type, bigEndian);
++                        if (subBox.length > io_->size() ) {
++                            throw Error(kerCorruptedMetadata);
++                        }
+ #ifdef EXIV2_DEBUG_MESSAGES
+                         std::cout << "Exiv2::Jp2Image::readMetadata: "
+                         << "subBox = " << toAscii(subBox.type) << " length = " << subBox.length << std::endl;
+@@ -308,7 +321,9 @@ namespace Exiv2
+                         }
+ 
+                         io_->seek(restore,BasicIo::beg);
+-                        io_->seek(subBox.length, Exiv2::BasicIo::cur);
++                        if ( io_->seek(subBox.length, Exiv2::BasicIo::cur) != 0 ) {
++                            throw Error(kerCorruptedMetadata);
++                        }
+                         restore = io_->tell();
+                     }
+                     break;
+diff --git a/tests/bugfixes/github/test_CVE_2017_17725.py b/tests/bugfixes/github/test_CVE_2017_17725.py
+index 1127b9806..670a75d8d 100644
+--- a/tests/bugfixes/github/test_CVE_2017_17725.py
++++ b/tests/bugfixes/github/test_CVE_2017_17725.py
+@@ -11,7 +11,7 @@ class TestCvePoC(metaclass=system_tests.CaseMeta):
+     filename = "$data_path/poc_2017-12-12_issue188"
+     commands = ["$exiv2 " + filename]
+     stdout = [""]
+-    stderr = ["""$exiv2_overflow_exception_message """ + filename + """:
+-$addition_overflow_message
++    stderr = ["""$exiv2_exception_message """ + filename + """:
++$kerCorruptedMetadata
+ """]
+     retval = [1]
+diff --git a/tests/bugfixes/github/test_issue_1011.py b/tests/bugfixes/github/test_issue_1011.py
+new file mode 100644
+index 000000000..415861188
+--- /dev/null
++++ b/tests/bugfixes/github/test_issue_1011.py
+@@ -0,0 +1,13 @@
++# -*- coding: utf-8 -*-
++
++from system_tests import CaseMeta, path
++
++class Test_issue_1011(metaclass=CaseMeta):
++
++    filename = path("$data_path/Jp2Image_readMetadata_loop.poc")
++    commands = ["$exiv2 " + filename]
++    stdout   = [""]
++    stderr   = ["""$exiv2_exception_message """ + filename + """:
++$kerCorruptedMetadata
++"""]
++    retval = [1]
+\ No newline at end of file
-- 
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