CVE-2018-1000030

Impact:
Low
Public Date:
2017-09-20
Bugzilla:
1541558: CVE-2018-1000030 python: Heap-Buffer-Overflow and Heap-Use-After-Free in Objects/fileobject.c

The MITRE CVE dictionary describes this issue as:

Python 2.7.14 is vulnerable to a Heap-Buffer-Overflow as well as a Heap-Use-After-Free. Python versions prior to 2.7.14 may also be vulnerable and it appears that Python 2.7.17 and prior may also be vulnerable however this has not been confirmed. The vulnerability lies when multiply threads are handling large amounts of data. In both cases there is essentially a race condition that occurs. For the Heap-Buffer-Overflow, Thread 2 is creating the size for a buffer, but Thread1 is already writing to the buffer without knowing how much to write. So when a large amount of data is being processed, it is very easy to cause memory corruption using a Heap-Buffer-Overflow. As for the Use-After-Free, Thread3->Malloc->Thread1->Free's->Thread2-Re-uses-Free'd Memory. The PSRT has stated that this is not a security vulnerability due to the fact that the attacker must be able to run code, however in some situations, such as function as a service, this vulnerability can potentially be used by an attacker to violate a trust boundary, as such the DWF feels this issue deserves a CVE.

Find out more about CVE-2018-1000030 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

Versions of Python 2 included in Red Hat Enterprise Linux 6 and 7 are affected by this issue. Reading concurrently from the same file handle in multiple threads is inherently unstable, and should not be relied upon in any real program. This issue is not planned to be fixed in future releases.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 3.6
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Impact None
Availability Impact Low

Affected Packages State

Platform Package State
Red Hat Software Collections for Red Hat Enterprise Linux rh-python35-python Not affected
Red Hat Software Collections for Red Hat Enterprise Linux python27-python Will not fix
Red Hat Software Collections for Red Hat Enterprise Linux rh-python34-python Not affected
Red Hat Software Collections for Red Hat Enterprise Linux rh-python36-python Not affected
Red Hat Enterprise Linux 7 python Will not fix
Red Hat Enterprise Linux 6 python Will not fix
Red Hat Enterprise Linux 5 python Will not fix
Last Modified

CVE description copyright © 2017, The MITRE Corporation