In glibc 2.26 and earlier there is confusion in the usage of getcwd()by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.
NOTE: The following CVSS v2.0 metrics and score provided are preliminary and subject to review.
|Base Score:||7.2||Base Metrics:||AV:L/AC:L/Au:N/C:C/I:C/A:C|
|Access Vector:||Local network||Attack Complexity:||Low|
|Authentication:||None required||Confidentiality Impact:||Complete|
|Integrity Impact:||Complete||Availability Impact:||Complete|
|Oracle Linux version 7 (glibc)||ELSA-2018-0805||2018-04-16|
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