GLSA 201701-28: c-ares: Heap-based buffer overflow
| Severity: | normal |
| Title: | c-ares: Heap-based buffer overflow |
| Date: | 01/11/2017 |
| Bugs: | |
| ID: | 201701-28 |
Synopsis
A heap-based buffer overflow in c-ares might allow remote attackers to cause a Denial of Service condition.Background
c-ares is a C library for asynchronous DNS requests (including name resolves).
Affected packages
| Package | Vulnerable | Unaffected | Architecture(s) |
|---|---|---|---|
| net-dns/c-ares | < 1.12.0 | >= 1.12.0 | All supported architectures |
Description
A hostname with an escaped trailing dot (such as “hello\.”) would have its size calculated incorrectly leading to a single byte written beyond the end of a buffer on the heap.
Impact
A remote attacker, able to provide a specially crafted hostname to an application using c-ares, could potentially cause a Denial of Service condition.
Workaround
There is no known workaround at this time.
Resolution
All c-ares users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/c-ares-1.12.0"
References
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.