Bug 235094 - CVE-2007-2052 Off-by-one in python's locale.strxfrm()
CVE-2007-2052 Off-by-one in python's locale.strxfrm()
Product: Fedora
Classification: Fedora
Component: python (Show other bugs)
All Linux
low Severity low
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Assigned To: James Antill
Brock Organ
: Security
Depends On:
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Reported: 2007-04-03 14:58 EDT by Lubomir Kundrak
Modified: 2008-05-06 15:27 EDT (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2008-05-06 15:27:00 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Lubomir Kundrak 2007-04-03 14:58:47 EDT
+++ This bug was initially created as a clone of Bug #235093 +++

Description of problem:

356         n1 = strlen(s) + 1;
357         buf = PyMem_Malloc(n1);
358         if (!buf)
359             return PyErr_NoMemory();
360         n2 = strxfrm(buf, s, n1);

In case the transformed string is longer than original string...
(see the PoC for an exapmle)

361         if (n2 > n1) {
362             /* more space needed */

We allocate n2 bytes here:

363             buf = PyMem_Realloc(buf, n2);
364             if (!buf)
365                 return PyErr_NoMemory();

And here the string will be n2 chars long and terminating NUL won't
fit and thus the string won't be terminated what can lead to an
information leak in certain rare cases (see the original Debian report
for details).

366             strxfrm(buf, s, n2);
367         }
368         result = PyString_FromString(buf);
369         PyMem_Free(buf);
370         return result;
371     }
373     #if defined(MS_WINDOWS)
374     static PyObject*
375     PyLocale_getdefaultlocale(PyObject* self)

Version-Release number of selected component (if applicable):


How reproducible:

Proof of concept code attached.

Additional info:

See the URL for an original bug report to Debian and PoC by Piotr Engelking.
It contains details on how to reproduce and recognize the flaw.

-- Additional comment from lkundrak@redhat.com on 2007-04-03 14:55 EST --
Created an attachment (id=151611)
Python's locale.strxfrm() off-by-one flaw PoC
Comment 2 Bug Zapper 2008-04-04 02:44:56 EDT
Fedora apologizes that these issues have not been resolved yet. We're
sorry it's taken so long for your bug to be properly triaged and acted
on. We appreciate the time you took to report this issue and want to
make sure no important bugs slip through the cracks.

If you're currently running a version of Fedora Core between 1 and 6,
please note that Fedora no longer maintains these releases. We strongly
encourage you to upgrade to a current Fedora release. In order to
refocus our efforts as a project we are flagging all of the open bugs
for releases which are no longer maintained and closing them.

If this bug is still open against Fedora Core 1 through 6, thirty days
from now, it will be closed 'WONTFIX'. If you can reporduce this bug in
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Comment 3 Bug Zapper 2008-05-06 15:26:59 EDT
This bug is open for a Fedora version that is no longer maintained and
will not be fixed by Fedora. Therefore we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen thus bug against that version.

Thank you for reporting this bug and we are sorry it could not be fixed.

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