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-rw-r--r--gnu/packages/patches/python-pycrypto-CVE-2013-7459.patch97
-rw-r--r--gnu/packages/python.scm12
2 files changed, 102 insertions, 7 deletions
diff --git a/gnu/packages/patches/python-pycrypto-CVE-2013-7459.patch b/gnu/packages/patches/python-pycrypto-CVE-2013-7459.patch
new file mode 100644
index 0000000000..3570b94e9b
--- /dev/null
+++ b/gnu/packages/patches/python-pycrypto-CVE-2013-7459.patch
@@ -0,0 +1,97 @@
+Fix CVE-2013-7459:
+
+https://github.com/dlitz/pycrypto/issues/176
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-7459
+
+Copied from Debian:
+
+https://anonscm.debian.org/cgit/collab-maint/python-crypto.git/commit/?id=0de2243837ed369a086f15c50cca2be85bdfab9d
+
+Debian adapts this upstream commit:
+
+https://github.com/dlitz/pycrypto/commit/8dbe0dc3eea5c689d4f76b37b93fe216cf1f00d4
+
+From 8dbe0dc3eea5c689d4f76b37b93fe216cf1f00d4 Mon Sep 17 00:00:00 2001
+From: Legrandin <helderijs@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(-)
+
+--- a/lib/Crypto/SelfTest/Cipher/common.py
++++ b/lib/Crypto/SelfTest/Cipher/common.py
+@@ -239,19 +239,34 @@ class RoundtripTest(unittest.TestCase):
+ 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)
+--- a/src/block_template.c
++++ b/src/block_template.c
+@@ -170,6 +170,17 @@ ALGnew(PyObject *self, PyObject *args, P
+ "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,
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 5faebae3d9..d8ca83d810 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -958,13 +958,11 @@ Python 3 support.")
(define-public python2-setuptools
(package-with-python2 python-setuptools))
-;;; Pycrypto is abandoned upstream [0] and contains at least one bug that can be
-;;; exploited to achieve arbitrary code execution [1].
+;;; Pycrypto is abandoned upstream:
;;;
-;;; TODO Remove this package from GNU Guix.
+;;; https://github.com/dlitz/pycrypto/issues/173
;;;
-;;; [0] https://github.com/dlitz/pycrypto/issues/173
-;;; [1] https://github.com/dlitz/pycrypto/issues/176
+;;; TODO Remove this package from GNU Guix.
(define-public python-pycrypto
(package
(name "python-pycrypto")
@@ -972,8 +970,8 @@ Python 3 support.")
(source
(origin
(method url-fetch)
- (uri (string-append "https://pypi.python.org/packages/source/p/"
- "pycrypto/pycrypto-" version ".tar.gz"))
+ (uri (pypi-uri "pycrypto" version))
+ (patches (search-patches "python-pycrypto-CVE-2013-7459.patch"))
(sha256
(base32
"0g0ayql5b9mkjam8hym6zyg6bv77lbh66rv1fyvgqb17kfc1xkpj"))))