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Amazon Linux: Security Advisory (ALAS-2014-380)

Information

Severity

Severity

Medium

Family

Family

Amazon Linux Local Security Checks

CVSSv2 Base

CVSSv2 Base

4.3

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

6 years ago

Modified

Modified

5 months ago

Share

Summary

The remote host is missing an update announced via the referenced Security Advisory.

Insight

Insight

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

Solution

Run yum update python27 to update your system.

Common Vulnerabilities and Exposures (CVE)

References

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