In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-19591 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of glibc as shipped with Red Hat Enterprise Linux 5, 6, and 7.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 5.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | glibc | Not affected |
| Red Hat Enterprise Linux 7 | compat-glibc | Not affected |
| Red Hat Enterprise Linux 6 | glibc | Not affected |
| Red Hat Enterprise Linux 6 | compat-glibc | Not affected |
| Red Hat Enterprise Linux 5 | compat-glibc | Not affected |
| Red Hat Enterprise Linux 5 | glibc | Not affected |
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