Bug 1412631 – CVE-2017-5340 php: Use of uninitialized memory in unserialize()

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Bug 1412631 - (CVE-2017-5340) CVE-2017-5340 php: Use of uninitialized memory in unserialize()

Summary:	CVE-2017-5340 php: Use of uninitialized memory in unserialize()

Status:	NEW

Aliases:	CVE-2017-5340

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20161229,repor...
Keywords:	Security

Depends On:	1412647 1412648 1412649 1412650 1412651 1412652 1412653 1412654 1412655 1412656 1412657 1554540
Blocks:
	Show dependency tree / graph

Reported:	2017-01-12 08:56 EST by Adam Mariš
Modified:	2018-06-29 18:17 EDT (History)
CC List:	8 users (show)

See Also:
Fixed In Version:	php 7.0.15, php 7.1.1
Doc Type:	If docs needed, set a value
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:1296	None	None	None	2018-05-03 01:05 EDT

Groups: None (edit)

Description Adam Mariš 2017-01-12 08:56:21 EST

It was found that PHP uses uninitialized memory during calls to `unserialize()`. The payload supplied to `unserialize()` may control this uninitialized memory region and thus may be used to trick PHP into operating on faked objects and calling attacker controlled destructor function pointers, effectively allowing arbitrary code execution.

Upstream bug:

https://bugs.php.net/bug.php?id=73832

Comment 1 Adam Mariš 2017-01-12 09:07:20 EST

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1412647]

Comment 3 Adam Mariš 2017-01-12 09:10:58 EST

This issue happens when untrusted input is unserialized. Doing so is documented as being unsafe:

  http://php.net/manual/en/function.unserialize.php

  Do not pass untrusted user input to unserialize(). Unserialization can
  result in code being loaded and executed due to object instantiation and
  autoloading, and a malicious user may be able to exploit this. Use a safe,
  standard data interchange format such as JSON (via json_decode() and
  json_encode()) if you need to pass serialized data to the user.

Comment 5 errata-xmlrpc 2018-05-03 01:05:44 EDT

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 7.3 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS

Via RHSA-2018:1296 https://access.redhat.com/errata/RHSA-2018:1296

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