CVE-2018-1000001
Description
From CVE.org
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.
Statement
This vulnerability affected the glibc package on Red Hat Enterprise Linux 7.4, however it can only be exploited when mount namespaces owned by user namespaces are enabled, which requires manually configuring a kernel parameter and sysctl that are not enabled by default. Please see the Bugzilla link for more details.
This vulnerability affects glibc on Red Hat Enterprise Linux 6. However the kernel included in Red Hat Enterprise Linux 6 does not violate glibc's assumption about the behaviour of getcwd(), so this vulnerability can not be exploited when running with the default kernel. Red Hat Enterprise Linux 6 containers may be vulnerable when running on a host with kernel 2.6.36 or greater.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | 7.8 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | High | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Acknowledgements
Red Hat would like to thank halfdog for reporting this issue.
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