SUSE Security Update: Security update for python-cffi, python-cryptography, python-xattr
______________________________________________________________________________

Announcement ID:    SUSE-SU-2020:0790-1
Rating:             moderate
References:         #1055478 #1070737 #1101820 #1111657 #1138748 
                    #1149792 #981848 
Cross-References:   CVE-2018-10903
Affected Products:
                    SUSE OpenStack Cloud 6-LTSS
                    SUSE Linux Enterprise Server for SAP 12-SP1
                    SUSE Linux Enterprise Server 12-SP1-LTSS
______________________________________________________________________________

   An update that solves one vulnerability and has 6 fixes is
   now available.

Description:

   This update for python-cffi, python-cryptography and python-xattr fixes
   the following issues:

   Security issue fixed:

   - CVE-2018-10903: Fixed GCM tag forgery via truncated tag in
     finalize_with_tag API (bsc#1101820).

   Non-security issues fixed:

   python-cffi was updated to 1.11.2 (bsc#1138748, jsc#ECO-1256, jsc#PM-1598):

   - fixed a build failure on i586 (bsc#1111657)
   - Salt was unable to highstate in snapshot 20171129 (bsc#1070737)

   - Update pytest in spec to add c directory tests in addition to testing
     directory.

   Update to 1.11.1:

   * Fix tests, remove deprecated C API usage
   * Fix (hack) for 3.6.0/3.6.1/3.6.2 giving incompatible binary extensions
     (cpython issue #29943)
   * Fix for 3.7.0a1+

   Update to 1.11.0:

   * Support the modern standard types char16_t and char32_t. These work like
     wchar_t: they represent one unicode character, or when used as charN_t *
     or charN_t[] they represent a unicode string. The difference with
     wchar_t is that they have a known, fixed size. They should work at all
     places that used to work with wchar_t (please report an issue if I
     missed something). Note that with set_source(), you need to make sure
     that these types are actually defined by the C source you provide (if
     used in cdef()).
   * Support the C99 types float _Complex and double _Complex. Note that
     libffi doesn't support them, which means that in the ABI mode you still
     cannot call C functions that take complex numbers directly as arguments
     or return type.
   * Fixed a rare race condition when creating multiple FFI instances from
     multiple threads. (Note that you aren't meant to create many FFI
     instances: in inline mode, you should write ffi = cffi.FFI() at module
     level just after import cffi; and in
     out-of-line mode you don't instantiate FFI explicitly at all.)
   * Windows: using callbacks can be messy because the CFFI internal error
     messages show up to stderr-but stderr goes nowhere in many applications.
     This makes it particularly hard to get started with the embedding mode.
     (Once you get started, you can at least use @ffi.def_extern(onerror=...)
     and send the error logs where it makes sense for your application, or
     record them in log files, and so on.) So what is new in CFFI is that
     now, on Windows CFFI will try to open a non-modal MessageBox (in
     addition to sending raw messages to stderr). The MessageBox is only
     visible if the process stays alive: typically, console applications that
     crash close immediately, but that is also the situation where stderr
     should be visible anyway.
   * Progress on support for callbacks in NetBSD.
   * Functions returning booleans would in some case still return 0
     or 1 instead of False or True. Fixed.
   * ffi.gc() now takes an optional third parameter, which gives an estimate
     of the size (in bytes) of the object. So far, this is
     only used by PyPy, to make the next GC occur more quickly (issue #320).
      In the future, this might have an effect on CPython too (provided the
      CPython issue 31105 is addressed).
   * Add a note to the documentation: the ABI mode gives function
     objects that are slower to call than the API mode does. For some reason
      it is often thought to be faster. It is not!

   Update to 1.10.1:

   * Fixed the line numbers reported in case of cdef() errors. Also, I just
     noticed, but pycparser always supported the preprocessor directive # 42
     "foo.h" to mean "from the next line, we're in file foo.h starting from
     line 42";, which it puts in the error messages.

   Update to 1.10.0:

    Issue #295: use calloc() directly instead of PyObject_Malloc()+memset()
   to handle ffi.new() with a default allocator. Speeds up
   ffi.new(large-array) where most of the time you never touch most of the
   array.
   * Some OS/X build fixes ("only with Xcode but without CLT";).
   * Improve a couple of error messages: when getting mismatched versions of
     cffi and its backend; and when calling functions which cannot be called
     with libffi because an argument is a struct that is "too complicated";
     (and not a struct pointer, which always works).
   * Add support for some unusual compilers (non-msvc, non-gcc, non-icc,
     non-clang)
   * Implemented the remaining cases for ffi.from_buffer. Now all
     buffer/memoryview objects can be passed. The one remaining check is
     against passing unicode strings in Python 2. (They support the buffer
     interface, but that gives the raw bytes behind the UTF16/UCS4 storage,
     which is most of the times not what you expect. In Python 3 this has
     been fixed and the unicode strings don't support the memoryview
     interface any more.)
   * The C type _Bool or bool now converts to a Python boolean when reading,
     instead of the content of the byte as an integer. The potential
     incompatibility here is what occurs if the byte contains a value
     different from 0 and 1. Previously, it would just return it; with this
     change, CFFI raises an exception in this case. But this case means
     "undefined behavior"; in C; if you really have to interface with a
     library relying on this, don't use bool in the CFFI side. Also, it is
     still valid to use a byte string as initializer for a bool[], but now it
     must only contain \x00 or \x01. As an aside, ffi.string() no longer
     works on bool[] (but it never made much sense, as this function stops at
     the first zero).
   * ffi.buffer is now the name of cffi's buffer type, and ffi.buffer() works
     like before but is the constructor of that type.
   * ffi.addressof(lib, "name") now works also in in-line mode, not only in
     out-of-line mode. This is useful for taking the address of global
      variables.
   * Issue #255: cdata objects of a primitive type (integers, floats, char)
     are now compared and ordered by value. For example, 
     compares equal to 42 and  compares equal to b'A'.
     Unlike C,  does not compare equal to ffi.cast("unsigned
     int", -1): it compares smaller, because -1 < 4294967295.
   * PyPy: ffi.new() and ffi.new_allocator()() did not record "memory
     pressure";, causing the GC to run too infrequently if you call ffi.new()
     very often and/or with large arrays. Fixed in PyPy 5.7.
   * Support in ffi.cdef() for numeric expressions with + or -. Assumes that
     there is no overflow; it should be fixed first before we add more
     general support for arbitrary arithmetic on constants.

   Update to 1.9.1:

   - Structs with variable-sized arrays as their last field: now we track the
     length of the array after ffi.new() is called, just like we always
     tracked the length of ffi.new("int[]", 42). This lets us detect
     out-of-range accesses to array items. This also lets us display a better
     repr(), and have the total size returned by ffi.sizeof() and
     ffi.buffer(). Previously both functions would return a result based on
     the size of the declared structure type, with an assumed empty array.
     (Thanks andrew for starting this refactoring.)
   - Add support in cdef()/set_source() for unspecified-length arrays in
     typedefs: typedef int foo_t[...];. It was already supported for global
     variables or structure fields.
   - I turned in v1.8 a warning from cffi/model.py into an error: 'enum xxx'
     has no values explicitly defined: refusing to guess which integer type
     it is meant to be (unsigned/signed, int/long). Now I'm turning it back
     to a warning again; it seems that guessing that the enum has size int is
     a 99%-safe bet. (But not 100%, so it stays as a warning.)
   - Fix leaks in the code handling FILE * arguments. In CPython 3 there is a
     remaining issue that is hard to fix: if you pass a Python file object to
     a FILE * argument, then os.dup() is used and the new file descriptor is
     only closed when the GC reclaims the Python file object-and not at the
     earlier time when you call close(), which only closes the original file
     descriptor. If this is an issue, you should avoid this automatic
     convertion of Python file objects: instead, explicitly manipulate file
     descriptors and call fdopen() from C (...via cffi).
   - When passing a void * argument to a function with a different pointer
     type,
     or vice-versa, the cast occurs automatically, like in C. The same occurs      for initialization with ffi.new() and a few other places. However, I
      thought that char * had the same property-but I was mistaken. In C you
      get the usual warning if you try to give a char * to a char **
      argument, for example. Sorry about the confusion. This has been fixed
      in CFFI by giving for now a warning, too. It will turn into an error in
      a future version.
   - Issue #283: fixed ffi.new() on structures/unions with nested anonymous
     structures/unions, when there is at least one union in the mix. When
     initialized with a list or a dict, it should now behave more closely
     like the { } syntax does in GCC.
   - CPython 3.x: experimental: the generated C extension modules now use the
     "limited API";, which means that, as a compiled .so/.dll, it should work
     directly on any version of CPython >= 3.2. The name produced by
     distutils is still version-specific. To get the version-independent
     name, you can rename it manually to NAME.abi3.so, or use the very recent
     setuptools 26.
   - Added ffi.compile(debug=...), similar to python setup.py build --debug
     but defaulting to True if we are running a debugging version of Python
     itself.
   - Removed the restriction that ffi.from_buffer() cannot be used on byte
     strings. Now you can get a char * out of a byte string, which is valid
     as long as the string object is kept alive. (But don't use it to modify
     the string object! If you need this, use bytearray or other official
     techniques.)
   - PyPy 5.4 can now pass a byte string directly to a char * argument (in
     older versions, a copy would be made). This used to be a CPython-only
     optimization.
   - ffi.gc(p, None) removes the destructor on an object previously created
     by another call to ffi.gc()
   - bool(ffi.cast("primitive type", x)) now returns False if the value is
     zero (including -0.0), and True otherwise. Previously this would only
     return False for cdata objects of a pointer type when the pointer is
     NULL.
   - bytearrays: ffi.from_buffer(bytearray-object) is now supported. (The
     reason it was not supported was that it was hard to do in PyPy, but it
     works since PyPy 5.3.) To call a C function with a char * argument from
     a buffer
     object-now including bytearrays—you write lib.foo(ffi.from_buffer(x)).
      Additionally, this is now supported: p[0:length] = bytearray-object.
      The problem with this was that a iterating over bytearrays gives
      numbers instead of characters. (Now it is implemented with just a
      memcpy, of course, not actually iterating over the characters.)
   - C++: compiling the generated C code with C++ was supposed to work, but
     failed if you make use the bool type (because that is rendered as the C
     _Bool type, which doesn't exist in C++).
   - help(lib) and help(lib.myfunc) now give useful information, as well as
     dir(p) where p is a struct or pointer-to-struct.

   - Fixed the "negative left shift" warning by replacing bitshifting in
     appropriate places by bitwise and comparison to self; patch taken from
     upstream git. Drop cffi-1.5.2-wnoerror.patch: no longer required.

   - disable "negative left shift" warning in test suite to prevent failures
     with gcc6, until upstream fixes the undefined code in question
     (bsc#981848)

   Update to version 1.6.0:

   * ffi.list_types()
   * ffi.unpack()
   * extern "Python+C";
   * in API mode, lib.foo.__doc__ contains the C signature now.
   * Yet another attempt at robustness of ffi.def_extern() against CPython's
     interpreter shutdown logic.

   Update to 1.5.2:

   * support for cffi-based embedding
   * more robustness for shutdown logic


   Updated python-cryptography to 2.1.4 (bsc#1138748, jsc#ECO-1256,
   jsc#PM-1598)

   - Make this version of the package compatible with OpenSSL 1.1.1d
     (bsc#1149792)

   - CVE-2018-10903: Fixed GCM tag forgery via truncated tag in
     finalize_with_tag API (bsc#1101820)

   Update to version 2.1.4:

   * Added X509_up_ref for an upcoming pyOpenSSL release.
   * Corrected a bug with the manylinux1 wheels where OpenSSL's stack was
     marked executable.
   * support for OpenSSL 1.0.0 has been removed.
   * Added support for Diffie-Hellman key exchange
   * The OS random engine for OpenSSL has been rewritten

   python-xattr was just rebuilt to adjust its cffi depedency.


Patch Instructions:

   To install this SUSE Security Update use the SUSE recommended installation methods
   like YaST online_update or "zypper patch".

   Alternatively you can run the command listed for your product:

   - SUSE OpenStack Cloud 6-LTSS:

      zypper in -t patch SUSE-OpenStack-Cloud-6-LTSS-2020-790=1

   - SUSE Linux Enterprise Server for SAP 12-SP1:

      zypper in -t patch SUSE-SLE-SAP-12-SP1-2020-790=1

   - SUSE Linux Enterprise Server 12-SP1-LTSS:

      zypper in -t patch SUSE-SLE-SERVER-12-SP1-2020-790=1



Package List:

   - SUSE OpenStack Cloud 6-LTSS (x86_64):

      python-cryptography-2.1.4-3.15.5
      python-cryptography-debuginfo-2.1.4-3.15.5
      python-cryptography-debugsource-2.1.4-3.15.5

   - SUSE Linux Enterprise Server for SAP 12-SP1 (x86_64):

      python-cffi-1.11.2-2.19.2
      python-cffi-debuginfo-1.11.2-2.19.2
      python-cffi-debugsource-1.11.2-2.19.2
      python-cryptography-2.1.4-3.15.5
      python-cryptography-debuginfo-2.1.4-3.15.5
      python-cryptography-debugsource-2.1.4-3.15.5
      python-xattr-0.7.5-3.2.1
      python-xattr-debuginfo-0.7.5-3.2.1
      python-xattr-debugsource-0.7.5-3.2.1
      python3-cffi-1.11.2-2.19.2
      python3-cryptography-2.1.4-3.15.5

   - SUSE Linux Enterprise Server 12-SP1-LTSS (ppc64le s390x x86_64):

      python-cffi-1.11.2-2.19.2
      python-cffi-debuginfo-1.11.2-2.19.2
      python-cffi-debugsource-1.11.2-2.19.2
      python-cryptography-2.1.4-3.15.5
      python-cryptography-debuginfo-2.1.4-3.15.5
      python-cryptography-debugsource-2.1.4-3.15.5
      python-xattr-0.7.5-3.2.1
      python-xattr-debuginfo-0.7.5-3.2.1
      python-xattr-debugsource-0.7.5-3.2.1
      python3-cffi-1.11.2-2.19.2
      python3-cryptography-2.1.4-3.15.5


References:

   https://www.suse.com/security/cve/CVE-2018-10903.html
   https://bugzilla.suse.com/1055478
   https://bugzilla.suse.com/1070737
   https://bugzilla.suse.com/1101820
   https://bugzilla.suse.com/1111657
   https://bugzilla.suse.com/1138748
   https://bugzilla.suse.com/1149792
   https://bugzilla.suse.com/981848