REDHAT-BUG-1808532: Null Pointer Dereference
First published: Fri Feb 28 2020(Updated: )
In PHP versions 7.2.x below 7.2.28, 7.3.x below 7.3.15 and 7.4.x below 7.4.3, when using file upload functionality, if upload progress tracking is enabled, but session.upload_progress.cleanup is set to 0 (disabled), and the file upload fails, the upload procedure would try to clean up data that does not exist and encounter null pointer dereference, which would likely lead to a crash. Reference: <a href="https://bugs.php.net/bug.php?id=79221">https://bugs.php.net/bug.php?id=79221</a>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PHP | >7.2.0<=7.2.28 | |
| PHP | >7.3.0<=7.3.15 | |
| PHP | >7.4.0<=7.4.3 |
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Reference Links
- https://bugs.php.net/bug.php?id=79221
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1808533
- http://git.php.net/?p=php-src.git;a=commit;h=d76f7c6c636b8240e06a1fa29eebb98ad005008a
- https://access.redhat.com/errata/RHSA-2020:3662
- https://access.redhat.com/security/cve/cve-2020-7062
- https://access.redhat.com/errata/RHSA-2020:5275
- https://bugzilla.redhat.com/show_bug.cgi?id=1808532
Frequently Asked Questions
What is the severity of REDHAT-BUG-1808532?
The severity of REDHAT-BUG-1808532 is considered high due to potential data exposure during failed file upload attempts.
How do I fix REDHAT-BUG-1808532?
To fix REDHAT-BUG-1808532, upgrade PHP to version 7.2.28, 7.3.15, or 7.4.3 or later.
What versions are affected by REDHAT-BUG-1808532?
REDHAT-BUG-1808532 affects PHP versions 7.2.x below 7.2.28, 7.3.x below 7.3.15, and 7.4.x below 7.4.3.
What are the consequences of not addressing REDHAT-BUG-1808532?
Not addressing REDHAT-BUG-1808532 may lead to improper handling of failed file uploads, which can result in data leaks.
Is it safe to disable session.upload_progress.cleanup in PHP regarding REDHAT-BUG-1808532?
Disabling session.upload_progress.cleanup is unsafe concerning REDHAT-BUG-1808532 as it can lead to residual session data after a failed upload.
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