CVE-2020-0038 - Out-of-bounds Read

Severity

75%

Complexity

39%

Confidentiality

60%

In rw_i93_sm_update_ndef of rw_i93.cc, there is a possible read of uninitialized data due to a missing bounds check. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-8.0 Android-8.1 Android-9 Android-10Android ID: A-143109193

CVSS 3.1 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

CVSS 2.0 Base Score 7.8. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/A:N).

Demo Examples

Out-of-bounds Read

CWE-125

In the following code, the method retrieves a value from an array at a specific array index location that is given as an input parameter to the method


               }
                     return value;// check that the array index is less than the maximum// length of the array
                           value = array[index];// get the value at the specified index of the array
// if array index is invalid then output error message// and return value indicating errorvalue = -1;

However, this method only verifies that the given array index is less than the maximum length of the array but does not check for the minimum value (CWE-839). This will allow a negative value to be accepted as the input array index, which will result in a out of bounds read (CWE-125) and may allow access to sensitive memory. The input array index should be checked to verify that is within the maximum and minimum range required for the array (CWE-129). In this example the if statement should be modified to include a minimum range check, as shown below.


               ...// check that the array index is within the correct// range of values for the array

Overview

Type

Google Android

First reported 4 years ago

2020-03-10 20:15:00

Last updated 4 years ago

2020-03-11 20:05:00

Affected Software

Google Android 8.0

8.0

Google Android 8.1

8.1

Google Android 9.0

9.0

Google Android 10.0

10.0

References

https://source.android.com/security/bulletin/2020-03-01

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