Bug 1495412 (CVE-2017-14494)
| Summary: | CVE-2017-14494 dnsmasq: information leak in the DHCPv6 relay code | ||||||
|---|---|---|---|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Fabio Olive Leite <fleite> | ||||
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> | ||||
| Status: | CLOSED ERRATA | QA Contact: | |||||
| Severity: | high | Docs Contact: | |||||
| Priority: | high | ||||||
| Version: | unspecified | CC: | apevec, chrisw, code, gmollett, itamar, jjoyce, jschluet, kbasil, laine, lhh, lpeer, markmc, mburns, p, pemensik, rbryant, sclewis, security-response-team, slinaber, srevivo, tdecacqu, thozza, veillard | ||||
| Target Milestone: | --- | Keywords: | Security | ||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | dnsmasq 2.78 | Doc Type: | If docs needed, set a value | ||||
| Doc Text: |
An information leak was found in dnsmasq in the DHCPv6 relay code. An attacker on the local network could send crafted DHCPv6 packets to dnsmasq causing it to forward the contents of process memory, potentially leaking sensitive data.
|
Story Points: | --- | ||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2017-10-02 18:15:53 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: | |||||||
| Bug Depends On: | 1495516, 1495517, 1496264, 1496265, 1497691 | ||||||
| Bug Blocks: | 1495418 | ||||||
| Attachments: |
|
||||||
|
Description
Fabio Olive Leite
2017-09-26 01:55:26 UTC
Acknowledgments: Name: Felix Wilhelm (Google Security Team), Fermin J. Serna (Google Security Team), Gabriel Campana (Google Security Team), Kevin Hamacher (Google Security Team), Ron Bowes (Google Security Team) Versions of dnsmasq shipped with Red Hat Enterprise Linux 6 and 5 do not include the DHCPv6 code which includes this flaw. Further details from the 2.78 pre-release CHANGELOG:
Fix information leak in DHCPv6. A crafted DHCPv6 packet can
cause dnsmasq to forward memory from outside the packet
buffer to a DHCPv6 server when acting as a relay.
CVE-2017-14494 applies.
Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana
and Kevin Hamacher of the Google Security Team for
finding this.
Created attachment 1330992 [details]
Upstream commit
External References: https://access.redhat.com/security/vulnerabilities/3199382 https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html Created dnsmasq tracking bugs for this issue: Affects: fedora-all [bug 1497691] Upstream commit: http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=33e3f1029c9ec6c63e430ff51063a6301d4b2262 Google Security Team's repository with test cases: https://github.com/google/security-research-pocs/tree/master/vulnerabilities/dnsmasq This issue has been addressed in the following products: Red Hat Enterprise Linux 7.2 Extended Update Support Red Hat Enterprise Linux 7.3 Extended Update Support Via RHSA-2017:2837 https://access.redhat.com/errata/RHSA-2017:2837 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2017:2836 https://access.redhat.com/errata/RHSA-2017:2836 Statement: Red Hat OpenStack Platform includes the dnsmasq-utils RPM which does not contain this flaw's affected code-paths; Red Hat OpenStack Platform is therefore listed as not affected. However, because all versions of Red Hat OpenStack Platform are based on Red Hat Enterprise Linux, all Red Hat OpenStack Platform users should absolutely upgrade the dnsmasq RPM from Red Hat Enterprise Linux as a matter of urgency using standard update mechanisms (such as 'yum update' or 'openstack overcloud update'). |