Bug 1305543 (CVE-2016-2554) - CVE-2016-2554 php: buffer overflow in handling of long link names in tar phar archives
Summary: CVE-2016-2554 php: buffer overflow in handling of long link names in tar phar...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-2554
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: 1305565
Blocks: 1305564
TreeView+ depends on / blocked
 
Reported: 2016-02-08 14:41 UTC by Adam Mariš
Modified: 2019-09-29 13:44 UTC (History)
13 users (show)

Fixed In Version: php 5.6.18, php 5.5.32
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-08-22 19:59:34 UTC


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2750 0 normal SHIPPED_LIVE Moderate: rh-php56 security, bug fix, and enhancement update 2016-11-15 16:40:02 UTC

Description Adam Mariš 2016-02-08 14:41:24 UTC
A stack overflow vulnerability was reported that may occur when decompressing tar archives due to phar_tar_writeheaders() potentially copying non-terminated linknames from entries parsed by phar_parse_tarfile().

Upstream bug:

https://bugs.php.net/bug.php?id=71488

Upstream patch:

https://git.php.net/?p=php-src.git;a=commit;h=07c7df68bd68bbe706371fccc77c814ebb335d9e

Comment 1 Adam Mariš 2016-02-08 15:13:00 UTC
Created php tracking bugs for this issue:

Affects: fedora-all [bug 1305565]

Comment 2 Andrej Nemec 2016-02-25 10:24:37 UTC
CVE assignment:

http://seclists.org/oss-sec/2016/q1/428

Comment 3 Tomas Hoger 2016-08-22 19:59:34 UTC
This is a stack-based buffer overflow, not stack overflow as indicated by the upstream bug summary.  In PHP packages included in Red Hat products, this issue is mitigated by the use of FORTIFY_SOURCE.  This protection causes the overflow to be detected before it actually happens and terminates program execution, limiting impact to crash of the PHP interpreter.

Note that Phar files are distribution format for PHP applications (similar to Java Jar format) and their content is typically executed on the server.  Malicious Phar archive can therefore execute code on the system without exploiting any parsing issues.

If Phar extension is not used, it can be disabled by commenting out the following line:

  extension=phar.so

in phar.ini to prevent loading of the extension.

Given the limited impact of this issue, there's currently no plan to backport the fix to the versions of PHP as shipped in Red Hat products.

Comment 5 errata-xmlrpc 2016-11-15 11:49:31 UTC
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS

Via RHSA-2016:2750 https://rhn.redhat.com/errata/RHSA-2016-2750.html


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