CVE-2018-8779
It was found that the UNIXSocket::open and UNIXServer::open ruby methods did not handle the NULL byte properly. An attacker, able to inject NULL bytes in the socket path, could possibly trigger an unspecified behavior of the ruby script.
Find out more about CVE-2018-8779 from the MITRE CVE dictionary dictionary and NIST NVD.
Statement
This issue did not affect the versions of ruby as shipped with Red Hat Enterprise Linux 5 and 6.
CVSS v3 metrics
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 3.7 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | Low |
| Availability Impact | None |
Affected Packages State
| Platform | Package | State |
|---|---|---|
| Red Hat Subscription Asset Manager 1 | ruby193-ruby | Will not fix |
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-ruby23-ruby | Affected |
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-ruby25-ruby | Affected |
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-ruby22-ruby | Will not fix |
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-ruby24-ruby | Affected |
| Red Hat Enterprise Linux 7 | ruby | Affected |
| Red Hat Enterprise Linux 6 | ruby | Not affected |
| Red Hat Enterprise Linux 5 | ruby | Not affected |
Mitigation
It is possible to test for presence of the NULL byte manually prior to call the affected methods.