Is CVE-2016-5873 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2016-5873 being exploited in the wild.

How severe is CVE-2016-5873?

Critical severity, with a CVSS score of 9.8, published 23 January 2017.

Which products and versions are affected?

PHP HTTP Extension before 3.0.1.

Is there a fix for CVE-2016-5873?

A patch was published on 2016-06-29: Fixed in pecl_http version 3.0.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2016-5873 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2016-5873?

Check whether you run PHP HTTP Extension or PHP Pecl Http at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2016-5873: PHP pecl_http buffer overflow in URL parsing

CVE-2016-5873 · Severity: critical · CVSS 9.8 · Published 2017-01-23

A security vulnerability exists in the pecl_http extension for PHP, which is used by web applications to handle and parse HTTP requests. By sending a specially crafted URL containing non-printable characters, a remote attacker can cause a memory error that allows them to take control of the server and execute unauthorized commands. This could lead to a complete system compromise, data theft, or service disruption.

Vendors: PHP.

Quick answers

Is CVE-2016-5873 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2016-5873 being exploited in the wild.
How severe is CVE-2016-5873?: Critical severity, with a CVSS score of 9.8, published 23 January 2017.
Which products and versions are affected?: PHP HTTP Extension before 3.0.1.
Is there a fix for CVE-2016-5873?: A patch was published on 2016-06-29: Fixed in pecl_http version 3.0.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2016-5873 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2016-5873?: Check whether you run PHP HTTP Extension or PHP Pecl Http at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow exists in the php_http_url_parse function within php_http_url.c of the pecl_http extension. The vulnerability is caused by improper bounds checking when converting non-printable characters into percent-encoded strings; specifically, the parser's offset was not correctly reset during a 'softfail' in scheme parsing, and the state->offset was incremented without verifying the allocated buffer size. An attacker can exploit this by sending a malicious URL to a PHP application using this extension, leading to a partial overwrite of callback function pointers (such as php_stream_ops). This can result in arbitrary code execution with the privileges of the PHP process. The issue is fixed in version 3.0.1.

Affected products

PHP pecl_http before 3.0.1

Timeline

2016-03-05: disclosed: Vulnerability reported to PHP bug tracker
2016-06-29: patched: Fixed in pecl_http version 3.0.1
2017-01-23: advisory: NVD publication date

References

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