Bug 1402351 (CVE-2016-9843) - CVE-2016-9843 zlib: Big-endian out-of-bounds pointer
Summary: CVE-2016-9843 zlib: Big-endian out-of-bounds pointer
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-9843
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1402352 1503325 1503326 1503327 1503328 1503329 1503330 1503331 1503332 1503333 1503334 1503335 1503336
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-12-07 10:10 UTC by Andrej Nemec
Modified: 2021-02-25 20:35 UTC (History)
45 users (show)

Fixed In Version: zlib 1.2.9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-12-07 10:12:35 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1220 0 normal SHIPPED_LIVE Moderate: java-1.8.0-ibm security update 2017-05-10 16:44:34 UTC
Red Hat Product Errata RHSA-2017:1221 0 normal SHIPPED_LIVE Moderate: java-1.7.1-ibm security update 2017-05-10 16:44:04 UTC
Red Hat Product Errata RHSA-2017:1222 0 normal SHIPPED_LIVE Moderate: java-1.6.0-ibm security update 2017-05-10 16:43:49 UTC
Red Hat Product Errata RHSA-2017:2999 0 normal SHIPPED_LIVE Critical: java-1.8.0-oracle security update 2017-12-14 20:18:50 UTC
Red Hat Product Errata RHSA-2017:3046 0 normal SHIPPED_LIVE Important: java-1.7.0-oracle security update 2017-12-14 20:24:06 UTC
Red Hat Product Errata RHSA-2017:3047 0 normal SHIPPED_LIVE Important: java-1.6.0-sun security update 2017-12-14 20:18:13 UTC
Red Hat Product Errata RHSA-2017:3453 0 normal SHIPPED_LIVE Important: java-1.8.0-ibm security update 2017-12-13 21:48:15 UTC

Description Andrej Nemec 2016-12-07 10:10:21 UTC 
There was a small optimization for PowerPCs to pre-increment a pointer when accessing a word, instead of post-incrementing. This required prefacing the loop with a decrement of the pointer, possibly pointing before the object passed. This is not compliant with the C standard, for which decrementing a pointer before its allocated memory is undefined. When tested on a modern PowerPC with a modern compiler, the optimization no longer has any effect.

External References:

https://wiki.mozilla.org/images/0/09/Zlib-report.pdf
https://docs.google.com/document/d/10i1KZS5so8xDqH2rplRa2xet0tyTvvJlLbQQmZIUIKE/edit#heading=h.t13tvnx4loq7

Upstream patch:

https://github.com/madler/zlib/commit/d1d577490c15a0c6862473d7576352a9f18ef811

CVE assignment:

http://seclists.org/oss-sec/2016/q4/602
Comment 1 Andrej Nemec 2016-12-07 10:14:24 UTC 
Created zlib tracking bugs for this issue:

Affects: fedora-all [bug 1402352]
Comment 2 errata-xmlrpc 2017-05-10 12:46:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6 Supplementary

Via RHSA-2017:1222 https://access.redhat.com/errata/RHSA-2017:1222
Comment 3 errata-xmlrpc 2017-05-10 12:48:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Supplementary
  Red Hat Enterprise Linux 6 Supplementary

Via RHSA-2017:1221 https://access.redhat.com/errata/RHSA-2017:1221
Comment 4 errata-xmlrpc 2017-05-10 12:50:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Supplementary
  Red Hat Enterprise Linux 6 Supplementary

Via RHSA-2017:1220 https://access.redhat.com/errata/RHSA-2017:1220
Comment 8 errata-xmlrpc 2017-10-23 07:48:37 UTC 
This issue has been addressed in the following products:

  Oracle Java for Red Hat Enterprise Linux 6
  Oracle Java for Red Hat Enterprise Linux 7

Via RHSA-2017:2999 https://access.redhat.com/errata/RHSA-2017:2999
Comment 9 errata-xmlrpc 2017-10-24 12:12:48 UTC 
This issue has been addressed in the following products:

  Oracle Java for Red Hat Enterprise Linux 6
  Oracle Java for Red Hat Enterprise Linux 7

Via RHSA-2017:3047 https://access.redhat.com/errata/RHSA-2017:3047
Comment 10 errata-xmlrpc 2017-10-24 12:18:34 UTC 
This issue has been addressed in the following products:

  Oracle Java for Red Hat Enterprise Linux 7
  Oracle Java for Red Hat Enterprise Linux 6

Via RHSA-2017:3046 https://access.redhat.com/errata/RHSA-2017:3046
Comment 11 Doran Moppert 2017-10-31 05:03:41 UTC 
Quoting from the report
<https://wiki.mozilla.org/images/0/09/Zlib-report.pdf>:

> We have identified five areas where code in zlib invokes undefined
> behavior in the C standard. Use of this code does not currently
> generate buggy binaries, but it is possible that with future compilers
> or platforms these latent bugs may manifest in compiled code

Using GCC on Red Hat Enterprise Linux supported architectures, the UB
described in this flaw does not manifest as a bug.
Comment 12 errata-xmlrpc 2017-12-13 16:50:22 UTC 
This issue has been addressed in the following products:

  Red Hat Satellite 5.8
  Red Hat Satellite 5.8 ELS

Via RHSA-2017:3453 https://access.redhat.com/errata/RHSA-2017:3453
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