CVE-2018-1000030

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Summary

CVECVE-2018-1000030
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2018-02-08 17:29:00 UTC
Updated2026-10-08 21:17:06 UTC
DescriptionPython 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.

Risk And Classification

Primary CVSS: v3.1 3.6 LOW from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L

EPSS: 0.011860000 probability, percentile 0.669780000 (date 2026-10-10)

Problem Types: CWE-416 | CWE-787 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary3.6LOWCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L
3.0[email protected]Secondary3.6LOWCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L
3.0CNADECLARED3.6LOWCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L
2.0[email protected]Primary3.3AV:L/AC:M/Au:N/C:P/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
Partial

AV:L/AC:M/Au:N/C:P/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 12.04 All All All
Operating System Canonical Ubuntu Linux 14.04 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Application Python Python All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Python Use-After-Free Description.pdf - Google Drive af854a3a-2127-422b-91ae-364da2661108 drive.google.com Third Party Advisory
USN-3817-2: Python vulnerabilities | Ubuntu security notices af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com Third Party Advisory
Dropbox - Python Bug - Simplify your life af854a3a-2127-422b-91ae-364da2661108 www.dropbox.com Permissions Required
USN-3817-1: Python vulnerabilities | Ubuntu security notices af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com Third Party Advisory
Python: Buffer overflow (GLSA 201811-02) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
Oracle Critical Patch Update Advisory - January 2020 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
Issue 31530: CVE-2018-1000030: Python 2.7 readahead feature of file objects is not thread safe - Python tracker af854a3a-2127-422b-91ae-364da2661108 bugs.python.org Issue Tracking, Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 296091 Oracle Solaris 11.4 Support Repository Update (SRU) 6.1.4 Missing (CPUJAN2019)
  • 710251 Gentoo Linux Python Buffer overflow Vulnerability (GLSA 201811-02)

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