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Amazon Linux AMI: Security patch for python27 (ALAS-2014-380) (CVE-2014-4616)

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Amazon Linux AMI: Security patch for python27 (ALAS-2014-380) (CVE-2014-4616)

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Published
09/26/2014
Created
07/25/2018
Added
09/26/2014
Modified
12/01/2017

Description

It was reported that Python built-in _json module have a flaw (insufficient bounds checking), which allows a local user to read current process' arbitrary memory.

Quoting the upstream bug report:

The sole prerequisites of this attack are that the attacker is able to control or influence the two parameters of the default scanstring function: the string to be decoded and the index.

The bug is caused by allowing the user to supply a negative index value. The index value is then used directly as an index to an array in the C code; internally the address of the array and its index are added to each other in order to yield the address of the value that is desired. However, by supplying a negative index value and adding this to the address of the array, the processor's register value wraps around and the calculated value will point to a position in memory which isn't within the bounds of the supplied string, causing the function to access other parts of the process memory.

Solution(s)

  • amazon-linux-upgrade-python27
  • amazon-linux-upgrade-python27-debuginfo
  • amazon-linux-upgrade-python27-devel
  • amazon-linux-upgrade-python27-libs
  • amazon-linux-upgrade-python27-test
  • amazon-linux-upgrade-python27-tools

References

  • amazon-linux-upgrade-python27
  • amazon-linux-upgrade-python27-debuginfo
  • amazon-linux-upgrade-python27-devel
  • amazon-linux-upgrade-python27-libs
  • amazon-linux-upgrade-python27-test
  • amazon-linux-upgrade-python27-tools

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