Python vulnerabilities

CVE-2018-1061 High · 7.5 CWE-20 Jun 19, 2018

python before versions 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1 and 3.7.0 is vulnerable to catastrophic...

python before versions 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1 and 3.7.0 is vulnerable to catastrophic backtracking in the difflib.IS_LINE_JUNK method. An attacker could use this flaw to cause denial of service.

CVE-2018-1060 High · 7.5 CWE-20 Jun 18, 2018

Improper Input Validation in Python

python before versions 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1 and 3.7.0 is vulnerable to catastrophic backtracking in pop3lib's apop() method. An attacker could use this flaw to cause denial of service.

CVE-2016-9063 Critical · 9.8 CWE-190 Jun 11, 2018

Integer Overflow or Wraparound in Mozilla Firefox

An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.

CVE-2018-1000030 Low · 3.6 CWE-416 Feb 8, 2018

Use After Free in Python

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.

CVE-2017-1000158 Critical · 9.8 CWE-190 Nov 17, 2017

Integer Overflow or Wraparound in Python

CPython (aka Python) up to 2.7.13 is vulnerable to an integer overflow in the PyString_DecodeEscape function in stringobject.c, resulting in heap-based buffer overflow (and possible arbitrary code execution)

CVE-2017-9233 High · 7.5 CWE-611 Jul 25, 2017

XML External Entity (XXE) in Libexpat Project Libexpat

XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.

CVE-2016-4472 High · 8.1 CWE-119 Jun 30, 2016

Buffer Errors (Improper Restriction of Operations within Memory Bounds) in Libexpat Project Libexpat

The overflow protection in Expat is removed by compilers with certain optimization settings, which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via crafted XML data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1283 and CVE-2015-2716.

CVE-2016-3189 Medium · 6.5 CWE-416 Jun 30, 2016

Use-after-free vulnerability in bzip2recover in bzip2 1.0.6 allows remote attackers to cause a...

Use-after-free vulnerability in bzip2recover in bzip2 1.0.6 allows remote attackers to cause a denial of service (crash) via a crafted bzip2 file, related to block ends set to before the start of the block.

CVE-2016-0718 Critical · 9.8 CWE-119 May 26, 2016

Buffer Errors (Improper Restriction of Operations within Memory Bounds) in Mozilla Firefox

Expat allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a malformed input document, which triggers a buffer overflow.

CVE-2013-0340 Medium · 6.8 CWE-611 Jan 21, 2014

expat 2.1.0 and earlier does not properly handle entities expansion unless an application...

expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.