Bug 1416499 – CVE-2016-7480 php: Use of uninitialized value in SplObjectStorag::unserialize

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Bug 1416499 - (CVE-2016-7480) CVE-2016-7480 php: Use of uninitialized value in SplObjectStorag::unserialize

Summary:	CVE-2016-7480 php: Use of uninitialized value in SplObjectStorag::unserialize

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-7480

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

Priority	medium Severity medium
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Assigned To:	Red Hat Product Security
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URL:
Whiteboard:	impact=moderate,public=20161006,repor...
Keywords:	Security

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Reported:	2017-01-25 11:05 EST by Adam Mariš
Modified:	2017-01-26 05:33 EST (History)
CC List:	9 users (show)

See Also:
Fixed In Version:	php 7.0.12
Doc Type:	If docs needed, set a value
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Last Closed:	2017-01-25 11:10:35 EST
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Description Adam Mariš 2017-01-25 11:05:54 EST

The SplObjectStorage unserialize implementation in ext/spl/spl_observer.c in PHP before 7.0.12 does not verify that a key is an object, which allows remote attackers to execute arbitrary code or cause a denial of service (uninitialized memory access) via crafted serialized data.

Upstream bug:

https://bugs.php.net/bug.php?id=73257

Upstream patch:

https://github.com/php/php-src/commit/61cdd1255d5b9c8453be71aacbbf682796ac77d4

External References:

http://blog.checkpoint.com/2016/12/27/check-point-discovers-three-zero-day-vulnerabilities-web-programming-language-php-7/

Comment 1 Adam Mariš 2017-01-25 11:10:35 EST

This issue happens when untrusted input is being unserialized which is documented as being insecure. 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. Consider using safe, standard data interchange  format such as JSON.

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