CVE-2021-43523
Published: 10 November 2021
In uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinfo, gethostbyaddr, and getnameinfo can lead to output of wrong hostnames (leading to domain hijacking) or injection into applications (leading to remote code execution, XSS, applications crashes, etc.). In other words, a validation step, which is expected in any stub resolver, does not occur.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
uclibc Launchpad, Ubuntu, Debian |
trusty |
Ignored
(end of standard support)
|
| upstream |
Needs triage
|
|
| xenial |
Ignored
(end of standard support)
|
|
|
uclibc-ng Launchpad, Ubuntu, Debian |
trusty |
Ignored
(end of standard support)
|
| upstream |
Needs triage
|
|
| xenial |
Ignored
(end of standard support)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.6 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |