Gentoo Websites Logo
Go to: Gentoo Home Documentation Forums Lists Bugs Planet Store Wiki Get Gentoo!
Bug 608706 (CVE-2016-6323) - <sys-libs/glibc-2.23-r3: Missing unwind info in __startcontext causes infinite loop in _Unwind_Backtrace
Summary: <sys-libs/glibc-2.23-r3: Missing unwind info in __startcontext causes infinit...
Status: RESOLVED FIXED
Alias: CVE-2016-6323
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal
Assignee: Gentoo Security
URL: https://sourceware.org/ml/libc-alpha/...
Whiteboard: A3 [glsa cve glsa blocked]
Keywords:
Depends on: CVE-2017-1000366
Blocks:
  Show dependency tree
 
Reported: 2017-02-09 09:13 UTC by Thomas Deutschmann (RETIRED)
Modified: 2017-06-20 17:55 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Thomas Deutschmann (RETIRED) gentoo-dev 2017-02-09 09:13:02 UTC 
CVE-2016-6323

The makecontext function in the GNU C Library (aka glibc or libc6) before 2.25 creates execution contexts incompatible with the unwinder on ARM EABI (32-bit) platforms, which might allow context-dependent attackers to cause a denial of service (hang), as demonstrated by applications compiled using gccgo, related to backtrace generation.

Upstream bug:

https://sourceware.org/bugzilla/show_bug.cgi?id=20435

Upstream patch:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9e2ff6c9cc54c0b4402b8d49e4abe7000fde7617
Comment 1 Thomas Deutschmann (RETIRED) gentoo-dev 2017-02-09 09:14:45 UTC 
@ Maintainer(s): The vulnerability is fixed in >=sys-libs/glibc-2.25. Please bump the package and tell us if you plan to backport the fix.
Comment 2 SpanKY gentoo-dev 2017-02-09 10:36:49 UTC 
this fix i had cherry picked into the first 2.24 patchset already
Comment 3 Matthias Maier gentoo-dev 2017-06-11 16:35:33 UTC 
The fix already made it into Patchset 5 for glibc 2.23.
Comment 4 Matthias Maier gentoo-dev 2017-06-19 16:30:55 UTC 
commit aa57c4a8ee21fa208a21388c1291260c1dd8c389
Author: Matthias Maier <tamiko@gentoo.org>
Date:   Thu Jun 8 11:20:38 2017 -0500

    profiles: Mask all glibc versions older than 2.23
Comment 5 GLSAMaker/CVETool Bot gentoo-dev 2017-06-20 17:55:34 UTC 
This issue was resolved and addressed in
 GLSA 201706-19 at https://security.gentoo.org/glsa/201706-19
by GLSA coordinator Thomas Deutschmann (whissi).