Bug 21934
| Summary: | glibc 2.2-5 has broken getnameinfo | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Philip Spencer <pspencer> |
| Component: | glibc | Assignee: | Jakub Jelinek <jakub> |
| Status: | CLOSED ERRATA | QA Contact: | Aaron Brown <abrown> |
| Severity: | medium | Docs Contact: | |
| Priority: | high | ||
| Version: | 7.0 | CC: | dr, fweimer, jarno.huuskonen |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2000-12-08 23:10:30 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Fixed in glibc-2.2-9. |
The new glibc-2.2-5 has a broken getnameinfo function. Specifically, the sense of the NI_NOFQDN flag is reversed. Calling getnameinfo(sa, salen, host, hostlen, serv, servlen, 0) returns ONLY THE INITIAL SEGMENT OF THE HOST NAME, whereas getnameinfo(sa, salen, host, hostlen, serv, servlen, NI_NOFQDN) returns the fully qualified domain name. This is the reverse of the proper behaviour (a flag of 0 should return the FQDN, and a flag of NI_NOFQDN should return only the host portion). I have classed this as a security bug since it breaks a lot of security-sensitive software (such as openssh with RSARhosts authentication). I cannot think of any way to exploit it, but anything that messes with hostname lookup in this manner is inherently dangerous.