dpkg: Security Advisory - CVE-2014-3127

v2 changes:
* update format for commit log
* add Upstream-Status for patch

commit a12eb58959d0a10584a428f4a3103a49204c410f upstream

Dpkg::Source::Patch: Outright reject C-style filenames in patches

Because patch only started recognizing C-style filenames in diffs
in version 2.7, it's not safe to assume one behaviour or the other,
as the system might or might not have a recent enough version, or
a GNU patch program at all. There's also no reason we should be
supporting this kind of strange encoded filenames in patches, when
we have not done so up to now.

Let's just ban these types of diffs and be done with it.

Fixes: CVE-2014-0471, CVE-2014-3127
Closes: #746306

[drop the text for debian/changelog,because it's not suitable
for the veriosn]
Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>
Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 69 insertions, 0 deletions

diff --git a/meta/recipes-devtools/dpkg/dpkg/dpkg-1.17.4-CVE-2014-0471-CVE-2014-3127.patch b/meta/recipes-devtools/dpkg/dpkg/dpkg-1.17.4-CVE-2014-0471-CVE-2014-3127.patch
new file mode 100644
index 0000000000..e59c6661ea
--- /dev/null
+++ b/meta/recipes-devtools/dpkg/dpkg/dpkg-1.17.4-CVE-2014-0471-CVE-2014-3127.patch
@@ -0,0 +1,68 @@
+dpkg: Security Advisory - CVE-2014-3127
+
+commit a12eb58959d0a10584a428f4a3103a49204c410f upstream
+
+dpkg 1.15.9 on Debian squeeze introduces support for the "C-style
+encoded filenames" feature without recognizing that the squeeze patch
+program lacks this feature, which triggers an interaction error that
+allows remote attackers to conduct directory traversal attacks and
+modify files outside of the intended directories via a crafted source
+package.
+
+NOTE: this can be considered a release engineering problem in the
+effort to fix CVE-2014-0471.
+
+Upstream-Status: Backport
+
+Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>
+Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
+=====================================================
+diff -uarN dpkg-1.17.1-org/scripts/Dpkg/Source/Patch.pm dpkg-1.17.1/scripts/Dpkg/Source/Patch.pm
+--- dpkg-1.17.1-org/scripts/Dpkg/Source/Patch.pm	2014-06-05 16:32:41.765446564 +0800
++++ dpkg-1.17.1/scripts/Dpkg/Source/Patch.pm	2014-06-05 16:37:21.461446359 +0800
+@@ -324,31 +324,6 @@
+     return $line;
+ }
+ 
+-my %ESCAPE = ((
+-    'a' => "\a",
+-    'b' => "\b",
+-    'f' => "\f",
+-    'n' => "\n",
+-    'r' => "\r",
+-    't' => "\t",
+-    'v' => "\cK",
+-    '\\' => '\\',
+-    '"' => '"',
+-), (
+-    map { sprintf('%03o', $_) => chr($_) } (0..255)
+-));
+-
+-sub _unescape {
+-    my ($diff, $str) = @_;
+-
+-    if (exists $ESCAPE{$str}) {
+-        return $ESCAPE{$str};
+-    } else {
+-        error(_g('diff %s patches file with unknown escape sequence \\%s'),
+-              $diff, $str);
+-    }
+-}
+-
+ # Fetch the header filename ignoring the optional timestamp
+ sub _fetch_filename {
+     my ($diff, $header) = @_;
+@@ -358,12 +333,7 @@
+ 
+     # Is it a C-style string?
+     if ($header =~ m/^"/) {
+-        $header =~ m/^"((?:[^\\"]|\\.)*)"/;
+-        error(_g('diff %s patches file with unbalanced quote'), $diff)
+-            unless defined $1;
+-
+-        $header = $1;
+-        $header =~ s/\\([0-3][0-7]{2}|.)/_unescape($diff, $1)/eg;
++	error(_g('diff %s patches file with C-style encoded filename'), $diff);
+     } else {
+         # Tab is the official separator, it's always used when
+         # filename contain spaces. Try it first, otherwise strip on space
diff --git a/meta/recipes-devtools/dpkg/dpkg_1.17.4.bb b/meta/recipes-devtools/dpkg/dpkg_1.17.4.bb
index 48e13948f0..83526f3c96 100644
--- a/meta/recipes-devtools/dpkg/dpkg_1.17.4.bb
+++ b/meta/recipes-devtools/dpkg/dpkg_1.17.4.bb
@@ -13,6 +13,7 @@ SRC_URI += "file://noman.patch \
             file://glibc2.5-sync_file_range.patch \
             file://no-vla-warning.patch \
             file://dpkg-1.17.4-CVE-2014-0471.patch \
+            file://dpkg-1.17.4-CVE-2014-0471-CVE-2014-3127.patch \
            "
 
 SRC_URI[md5sum] = "cc25086e1e3bd9512a95f14cfe9002e1"