CVE-2018-1000030
Published: 8 February 2018
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.
Notes
Author | Note |
---|---|
mdeslaur | original fix caused a regression, see second commit |
Priority
Status
Package | Release | Status |
---|---|---|
python2.7 Launchpad, Ubuntu, Debian |
cosmic |
Not vulnerable
(2.7.15~rc1-1)
|
artful |
Ignored
(end of life)
|
|
bionic |
Not vulnerable
(2.7.15~rc1-1)
|
|
trusty |
Released
(2.7.6-8ubuntu0.5)
|
|
upstream |
Needs triage
|
|
xenial |
Released
(2.7.12-1ubuntu0~16.04.4)
|
|
Patches: upstream: https://github.com/python/cpython/commit/6401e5671781eb217ee1afb4603cc0d1b0367ae6 upstream: https://github.com/python/cpython/commit/dbf52e02f18dac6f5f0a64f78932f3dc6efc056b |
||
python2.6 Launchpad, Ubuntu, Debian |
upstream |
Needs triage
|
trusty |
Does not exist
|
|
xenial |
Does not exist
|
|
artful |
Does not exist
|
|
bionic |
Does not exist
|
|
cosmic |
Does not exist
|
|
python3.2 Launchpad, Ubuntu, Debian |
upstream |
Needs triage
|
trusty |
Does not exist
|
|
xenial |
Does not exist
|
|
artful |
Does not exist
|
|
bionic |
Does not exist
|
|
cosmic |
Does not exist
|
|
python3.4 Launchpad, Ubuntu, Debian |
artful |
Does not exist
|
bionic |
Does not exist
|
|
cosmic |
Does not exist
|
|
trusty |
Not vulnerable
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
|
python3.5 Launchpad, Ubuntu, Debian |
artful |
Does not exist
|
bionic |
Does not exist
|
|
cosmic |
Does not exist
|
|
trusty |
Not vulnerable
|
|
upstream |
Not vulnerable
|
|
xenial |
Not vulnerable
|
|
python3.6 Launchpad, Ubuntu, Debian |
artful |
Not vulnerable
|
bionic |
Not vulnerable
|
|
cosmic |
Not vulnerable
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
|
python3.7 Launchpad, Ubuntu, Debian |
artful |
Not vulnerable
|
bionic |
Not vulnerable
|
|
cosmic |
Not vulnerable
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 3.6 |
Attack vector | Local |
Attack complexity | High |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | Low |
Integrity impact | None |
Availability impact | Low |
Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L |