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Bug 1451700 - (CVE-2017-8923) CVE-2017-8923 php: Overflowing the length of string causes crash
CVE-2017-8923 php: Overflowing the length of string causes crash
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170512,repor...
: Security
Depends On: 1451701
Blocks: 1451702
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Reported: 2017-05-17 06:25 EDT by Adam Mariš
Modified: 2017-07-05 01:34 EDT (History)
9 users (show)

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Last Closed: 2017-07-05 01:34:05 EDT
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Description Adam Mariš 2017-05-17 06:25:02 EDT 
The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.

Upstream bug:

https://bugs.php.net/bug.php?id=74577
Comment 1 Adam Mariš 2017-05-17 06:25:23 EDT 
Created php tracking bugs for this issue:

Affects: fedora-all [bug 1451701]
Comment 2 Huzaifa S. Sidhpurwala 2017-07-05 01:34:05 EDT 
This seems to be a flaw in handling very large strings. It is unlikely that this flaw will be triggered by malicious user input, therefore this has very limited security impact.
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