Bug 1051717 (CVE-2014-0591)
| Summary: | CVE-2014-0591 bind: named crash when handling malformed NSEC3-signed zones | ||||||||
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| Product: | [Other] Security Response | Reporter: | Vincent Danen <vdanen> | ||||||
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> | ||||||
| Status: | CLOSED ERRATA | QA Contact: | |||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | medium | ||||||||
| Version: | unspecified | CC: | carnil, codonell, ddu, hayato.suzuki, jorti, jrusnack, myamazak, pfrields, psimerda, security-response-team, spoyarek, thozza, tkubota, vonsch, ykinoshi | ||||||
| Target Milestone: | --- | Keywords: | Security | ||||||
| Target Release: | --- | ||||||||
| Hardware: | All | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | bind 9.6-esv-r10-p2, bind 9.8.6-p2, bind 9.9.4-p2 | Doc Type: | Bug Fix | ||||||
| Doc Text: |
A denial of service flaw was found in the way BIND handled queries for NSEC3-signed zones. A remote attacker could use this flaw against an authoritative name server that served NCES3-signed zones by sending a specially crafted query, which, when processed, would cause named to crash.
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Story Points: | --- | ||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2014-09-18 03:02:09 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: | 1052010, 1052011, 1052708, 1052766, 1079892 | ||||||||
| Bug Blocks: | 1051720, 1063682 | ||||||||
| Attachments: |
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Description
Vincent Danen
2014-01-11 01:56:54 UTC
Created attachment 848662 [details]
bind 9.8.6 patch
This is a diff of 9.8.6-P1 vs 9.8.6-P2 which includes the fix. It also includes one unrelated fix as well:
3693. [security] memcpy was incorrectly called with overlapping
ranges resulting in malformed names being generated
on some platforms. This could cause INSIST failures
when serving NSEC3 signed zones. [RT #35120]
3658. [port] linux: Address platform specific compilation issue
when libcap-devel is installed. [RT #34838]
Created attachment 848664 [details]
bind 9.9.4 patch
This is a diff of 9.9.4-P1 vs 9.9.4-P2 which includes the fix. It also includes one unrelated fix as well:
3693. [security] memcpy was incorrectly called with overlapping
ranges resulting in malformed names being generated
on some platforms. This could cause INSIST failures
when serving NSEC3 signed zones. [RT #35120]
3658. [port] linux: Address platform specific compilation issue
when libcap-devel is installed. [RT #34838]
The second reference below has a FAQ, one of which is the question of what caused the flaw. The answer is: "The bug (which causes an INSIST crash in name.c) is caused by a misuse of the standard memcpy() function which is, by happenstance, safe on most platforms: in this case a memory buffer was being copied to an overlapping buffer. The bug went undetected until recently because most implementations of memcpy() do handle this situation safely, but the standard does not require them to do so. Recent optimizations to glibc have removed the safetly net, exposing a long-existing but previously harmless coding error in named." This is related to newer implementations of glibc's memcpy() function. External References: https://kb.isc.org/article/AA-01078/0 https://kb.isc.org/article/AA-01085 Created bind tracking bugs for this issue: Affects: fedora-all [bug 1052708] bind-9.9.3-14.P2.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report. bind-9.9.4-11.P2.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report. This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2014:0043 https://rhn.redhat.com/errata/RHSA-2014-0043.html As discussed in comment #10, this flaws would affect bind only if used with glibc versions which have newer implementation of the memcpy() function. Therefore it does not directly affect the version of bind97 shipped in Red Hat Enterprise Linux 5. Nevertheless, to protect against this flaw appearing in future builds of bind97 (possibly done with different compiler or C library optimization), Red Hat Security Response Team has decided to address this issue. There is no plan for an immediate update correcting this issue, it will be corrected with future bind97 packages updates. Statement: This issue does not affect the version of bind and bind97 as shipped with Red Hat Enterprise Linux 5. For a technical explanation please see https://bugzilla.redhat.com/show_bug.cgi?id=1051717#c25 Note: The following references pertain to "memcpy() optimizations" mentioned in the previous comments on this bug: https://sourceware.org/bugzilla/show_bug.cgi?id=12518 http://article.gmane.org/gmane.comp.lib.glibc.alpha/15278 https://bugzilla.redhat.com/show_bug.cgi?id=638477 IssueDescription: A denial of service flaw was found in the way BIND handled queries for NSEC3-signed zones. A remote attacker could use this flaw against an authoritative name server that served NCES3-signed zones by sending a specially crafted query, which, when processed, would cause named to crash. This issue has been addressed in the following products: Red Hat Enterprise Linux 5 Via RHSA-2014:1244 https://rhn.redhat.com/errata/RHSA-2014-1244.html |