libbpg contains a type confusion vulnerability that leads to out of bounds write

Overview

libbpg is a library for the BPG graphics format. libbpg 0.9.5 through 0.9.7 may allow a crafted file to write out-of-bounds, which may lead to denial of service or arbitrary code execution.

Description

CWE-787**: Out-of-bounds Write -**CVE-2016-5637

According to the reporter, improper checking of transquant_bypass_enable_flag in the function restore_tqb_pixels in libbpg 0.9.5 through 0.9.7 may allow a crafted file to write out-of-bounds, which may lead to denial of service or arbitrary code execution.

Other versions may also be impacted. The CERT/CC has not been able to confirm this information with libbpg developers.

libbpg is used within other products; see the Vendor Status list below for more information.

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Impact

By causing an application that uses libbpg to process a malformed image, a remote unauthenticated attacker may be able to write to memory, which may lead to denial of service or arbitrary code execution.

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Solution

The CERT/CC is currently unaware of a practical solution to this problem. Users may consider the following workarounds:

Update ImageMagick Security Policy

ImageMagick’s security policy may be updated to deny BPG from use by modifying the policy.xml configuration file. The BPG element may also be removed from the delegate.xml configuration file. More information on these configuration files is available at ImageMagick’s website.

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Vendor Information

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libbpg Affected

Notified: June 03, 2016 Updated: June 27, 2016

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
Temporal	5.8	E:POC/RL:U/RC:UR
Environmental	4.4	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

• <http://bellard.org/bpg/&gt;
• <http://www.imagemagick.org/script/security-policy.php&gt;

Acknowledgements

Thanks to Shi Ji (@Puzzor) for reporting this vulnerability.

This document was written by Garret Wassermann.

Other Information

CVE IDs:	CVE-2016-5637
Date Public:	2016-07-12 Date First Published: