Bug 1223412 (CVE-2015-4022) - CVE-2015-4022 php: integer overflow leading to heap overflow when reading FTP file listing
Summary: CVE-2015-4022 php: integer overflow leading to heap overflow when reading FTP...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2015-4022
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1223447 1228052 1228053 1228054 1228055 1228056 1228057 1228058 1228059 1228060 1228061
Blocks: 1222994
TreeView+ depends on / blocked
 
Reported: 2015-05-20 13:19 UTC by Vasyl Kaigorodov
Modified: 2019-09-29 13:33 UTC (History)
16 users (show)

Fixed In Version: php 5.4.41, php 5.5.25, php 5.6.9
Doc Type: Bug Fix
Doc Text:
An integer overflow flaw leading to a heap-based buffer overflow was found in the way PHP's FTP extension parsed file listing FTP server responses. A malicious FTP server could use this flaw to cause a PHP application to crash or, possibly, execute arbitrary code.
Clone Of:
Environment:
Last Closed: 2015-07-10 16:34:33 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
PHP Bug Tracker 69545 0 None None None Never
Red Hat Product Errata RHSA-2015:1135 0 normal SHIPPED_LIVE Important: php security and bug fix update 2015-06-23 12:11:40 UTC
Red Hat Product Errata RHSA-2015:1186 0 normal SHIPPED_LIVE Important: php55-php security update 2015-06-25 12:31:54 UTC
Red Hat Product Errata RHSA-2015:1187 0 normal SHIPPED_LIVE Important: rh-php56-php security update 2015-06-25 12:43:17 UTC
Red Hat Product Errata RHSA-2015:1218 0 normal SHIPPED_LIVE Moderate: php security update 2015-07-09 21:01:41 UTC
Red Hat Product Errata RHSA-2015:1219 0 normal SHIPPED_LIVE Moderate: php54-php security update 2015-07-09 22:53:28 UTC

Description Vasyl Kaigorodov 2015-05-20 13:19:47 UTC 
The ftp_genlist() function of the ftp extension is prone to an integer overflow, which may result in remote code execution under certain circumstances.

Upstream report:
https://bugs.php.net/bug.php?id=69545

Upstream fix:
http://git.php.net/?p=php-src.git;a=commitdiff;h=ac2832935435556dc593784cd0087b5e576bbe4d

CVE request:
http://seclists.org/oss-sec/2015/q2/479
Comment 1 Vasyl Kaigorodov 2015-05-20 14:12:32 UTC 
Created php tracking bugs for this issue:

Affects: fedora-all [bug 1223447]
Comment 2 Fedora Update System 2015-05-26 03:40:28 UTC 
php-5.6.9-1.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 3 Fedora Update System 2015-05-27 16:13:09 UTC 
php-5.6.9-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 4 Fedora Update System 2015-05-27 16:23:35 UTC 
php-5.5.25-1.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 5 Tomas Hoger 2015-05-28 10:34:50 UTC 
A mitigating factor here is that counter which is overflown is incremented based on actually received data.  Hence application needs to consume ~2GB (or ~512MB on 32bit platforms when using certain older PHP versions) of server response data to trigger overflow.

Upstream fix applied in versions 5.4.41, 5.5.25 and 5.6.9 was found to be incomplete, still making it possible to trigger overflow on 32bit platforms:

https://bugs.php.net/bug.php?id=69545#1431550655

Additionally, when backporting fix to older PHP versions (prior to 5.4.22 and 5.5.6), we need to include this fix to avoid integer overflow in the third argument to safe_emalloc():

http://git.php.net/?p=php-src.git;a=commitdiff;h=8f4a6d6e1b6c36259a5dc865d16f0dad76f2f2c9

A related commit, which is really a cosmetic change, but is needed to have 8f4a6d6 commit above apply cleanly:

http://git.php.net/?p=php-src.git;a=commitdiff;h=1494298231072d5991e76db5ef25f20e81018106
Comment 12 Tomas Hoger 2015-06-04 13:07:36 UTC 
(In reply to Tomas Hoger from comment #5)
> Upstream fix applied in versions 5.4.41, 5.5.25 and 5.6.9 was found to be
> incomplete, still making it possible to trigger overflow on 32bit platforms:
> 
> https://bugs.php.net/bug.php?id=69545#1431550655

Upstream fix was corrected via this commit:

http://git.php.net/?p=php-src.git;a=commitdiff;h=0765623d6991b62ffcd93ddb6be8a5203a2fa7e2
Comment 13 errata-xmlrpc 2015-06-23 08:13:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1135 https://rhn.redhat.com/errata/RHSA-2015-1135.html
Comment 14 errata-xmlrpc 2015-06-25 08:32:36 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 6.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS

Via RHSA-2015:1186 https://rhn.redhat.com/errata/RHSA-2015-1186.html
Comment 15 errata-xmlrpc 2015-06-25 08:43:56 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 6.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS

Via RHSA-2015:1187 https://rhn.redhat.com/errata/RHSA-2015-1187.html
Comment 16 errata-xmlrpc 2015-07-09 17:07:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:1218 https://rhn.redhat.com/errata/RHSA-2015-1218.html
Comment 17 errata-xmlrpc 2015-07-09 18:53:49 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 6.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS

Via RHSA-2015:1219 https://rhn.redhat.com/errata/RHSA-2015-1219.html
Comment 18 Tomas Hoger 2015-07-10 16:27:27 UTC 
(In reply to Tomas Hoger from comment #5)
> Upstream fix applied in versions 5.4.41, 5.5.25 and 5.6.9 was found to be
> incomplete, still making it possible to trigger overflow on 32bit platforms:
> 
> https://bugs.php.net/bug.php?id=69545#1431550655

A new CVE id CVE-2015-4643 was assigned to the incomplete fix issue, see bug 1234938.  All PHP updates for Red Hat Enterprise Linux and Red Hat Software Collections that corrected this issue CVE-2015-4022 (see comment 13 to comment 17 above) included complete fix and hence also corrected CVE-2015-4643.
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