[arch-commits] Commit in pycrypto/trunk (CVE-2013-7459.patch PKGBUILD)
Levente Polyak
anthraxx at archlinux.org
Sun Jan 15 22:35:16 UTC 2017
Date: Sunday, January 15, 2017 @ 22:35:15
Author: anthraxx
Revision: 286650
upgpkg: pycrypto 2.6.1-5 (security update)
Fixes CVE-2013-7459
Added:
pycrypto/trunk/CVE-2013-7459.patch
Modified:
pycrypto/trunk/PKGBUILD
---------------------+
CVE-2013-7459.patch | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++
PKGBUILD | 11 +++---
2 files changed, 95 insertions(+), 4 deletions(-)
Added: CVE-2013-7459.patch
===================================================================
--- CVE-2013-7459.patch (rev 0)
+++ CVE-2013-7459.patch 2017-01-15 22:35:15 UTC (rev 286650)
@@ -0,0 +1,88 @@
+From 8dbe0dc3eea5c689d4f76b37b93fe216cf1f00d4 Mon Sep 17 00:00:00 2001
+From: Legrandin <helderijs at gmail.com>
+Date: Sun, 22 Dec 2013 22:24:46 +0100
+Subject: [PATCH] Throw exception when IV is used with ECB or CTR
+
+The IV parameter is currently ignored when initializing
+a cipher in ECB or CTR mode.
+
+For CTR mode, it is confusing: it takes some time to see
+that a different parameter is needed (the counter).
+
+For ECB mode, it is outright dangerous.
+
+This patch forces an exception to be raised.
+---
+ lib/Crypto/SelfTest/Cipher/common.py | 31 +++++++++++++++++++++++--------
+ src/block_template.c | 11 +++++++++++
+ 2 files changed, 34 insertions(+), 8 deletions(-)
+
+diff --git a/lib/Crypto/SelfTest/Cipher/common.py b/lib/Crypto/SelfTest/Cipher/common.py
+index 420b6ff..a5f8a88 100644
+--- a/lib/Crypto/SelfTest/Cipher/common.py
++++ b/lib/Crypto/SelfTest/Cipher/common.py
+@@ -239,19 +239,34 @@ def shortDescription(self):
+ return """%s .decrypt() output of .encrypt() should not be garbled""" % (self.module_name,)
+
+ def runTest(self):
+- for mode in (self.module.MODE_ECB, self.module.MODE_CBC, self.module.MODE_CFB, self.module.MODE_OFB, self.module.MODE_OPENPGP):
++
++ ## ECB mode
++ mode = self.module.MODE_ECB
++ encryption_cipher = self.module.new(a2b_hex(self.key), mode)
++ ciphertext = encryption_cipher.encrypt(self.plaintext)
++ decryption_cipher = self.module.new(a2b_hex(self.key), mode)
++ decrypted_plaintext = decryption_cipher.decrypt(ciphertext)
++ self.assertEqual(self.plaintext, decrypted_plaintext)
++
++ ## OPENPGP mode
++ mode = self.module.MODE_OPENPGP
++ encryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv)
++ eiv_ciphertext = encryption_cipher.encrypt(self.plaintext)
++ eiv = eiv_ciphertext[:self.module.block_size+2]
++ ciphertext = eiv_ciphertext[self.module.block_size+2:]
++ decryption_cipher = self.module.new(a2b_hex(self.key), mode, eiv)
++ decrypted_plaintext = decryption_cipher.decrypt(ciphertext)
++ self.assertEqual(self.plaintext, decrypted_plaintext)
++
++ ## All other non-AEAD modes (but CTR)
++ for mode in (self.module.MODE_CBC, self.module.MODE_CFB, self.module.MODE_OFB):
+ encryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv)
+ ciphertext = encryption_cipher.encrypt(self.plaintext)
+-
+- if mode != self.module.MODE_OPENPGP:
+- decryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv)
+- else:
+- eiv = ciphertext[:self.module.block_size+2]
+- ciphertext = ciphertext[self.module.block_size+2:]
+- decryption_cipher = self.module.new(a2b_hex(self.key), mode, eiv)
++ decryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv)
+ decrypted_plaintext = decryption_cipher.decrypt(ciphertext)
+ self.assertEqual(self.plaintext, decrypted_plaintext)
+
++
+ class PGPTest(unittest.TestCase):
+ def __init__(self, module, params):
+ unittest.TestCase.__init__(self)
+diff --git a/src/block_template.c b/src/block_template.c
+index f940e0e..d555ceb 100644
+--- a/src/block_template.c
++++ b/src/block_template.c
+@@ -170,6 +170,17 @@ ALGnew(PyObject *self, PyObject *args, PyObject *kwdict)
+ "Key cannot be the null string");
+ return NULL;
+ }
++ if (IVlen != 0 && mode == MODE_ECB)
++ {
++ PyErr_Format(PyExc_ValueError, "ECB mode does not use IV");
++ return NULL;
++ }
++ if (IVlen != 0 && mode == MODE_CTR)
++ {
++ PyErr_Format(PyExc_ValueError,
++ "CTR mode needs counter parameter, not IV");
++ return NULL;
++ }
+ if (IVlen != BLOCK_SIZE && mode != MODE_ECB && mode != MODE_CTR)
+ {
+ PyErr_Format(PyExc_ValueError,
Modified: PKGBUILD
===================================================================
--- PKGBUILD 2017-01-15 21:20:24 UTC (rev 286649)
+++ PKGBUILD 2017-01-15 22:35:15 UTC (rev 286650)
@@ -5,20 +5,23 @@
pkgbase=pycrypto
pkgname=('python2-crypto' 'python-crypto')
pkgver=2.6.1
-pkgrel=4
+pkgrel=5
arch=('i686' 'x86_64')
makedepends=('python2' 'python' 'gmp')
url="http://www.dlitz.net/software/pycrypto/"
license=('custom')
-source=(http://ftp.dlitz.net/pub/dlitz/crypto/${pkgbase}/${pkgbase}-${pkgver}.tar.gz{,.asc})
+source=(http://ftp.dlitz.net/pub/dlitz/crypto/${pkgbase}/${pkgbase}-${pkgver}.tar.gz{,.asc}
+ CVE-2013-7459.patch)
sha256sums=('f2ce1e989b272cfcb677616763e0a2e7ec659effa67a88aa92b3a65528f60a3c'
- 'c2ab0516cc55321e6543ae75e2aa6f6e56e97432870f32a7799f3b89f467dc1b')
+ 'SKIP'
+ '71310698e88a7b960467ec2107e0aaed1cb106d0d7b8b4f381ee9cdf4d9a7c7a')
validpgpkeys=('19E11FE8B3CFF273ED174A24928CEC1339C25CF7') # Dwayne Litzenberger
prepare() {
find ${pkgbase}-${pkgver}/LEGAL -type f -exec chmod 644 {} \;
find ${pkgbase}-${pkgver}/LEGAL -type d -exec chmod 755 {} \;
-
+
+ patch -d ${pkgbase}-${pkgver} -p1 < "${srcdir}/CVE-2013-7459.patch"
cp -r ${pkgbase}-${pkgver} ${pkgbase}-${pkgver}-py3
}
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