#VU39764 NULL pointer dereference in libpng - CVE-2016-10087

Vulnerability identifier: #VU39764

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-10087

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libpng
Universal components / Libraries / Libraries used by multiple products

Vendor: libpng

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in libpng 0.71 before 1.0.67, 1.2.x before 1.2.57, 1.4.x before 1.4.20, 1.5.x before 1.5.28, and 1.6.x before 1.6.27 allows context-dependent attackers to cause a NULL pointer dereference vectors involving loading a text chunk into a png structure, removing the text, and then adding another text chunk to the structure. A remote attacker can perform a denial of service (DoS) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

libpng: 0.8 - 0.99, 1.0.0a - 1.0.66, 1.2.0 - 1.2.56, 1.4.0 - 1.4.19, 1.5.0 - 1.5.27, 1.6.0 - 1.6.26

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External links
https://www.openwall.com/lists/oss-security/2016/12/29/2
https://www.openwall.com/lists/oss-security/2016/12/30/4
https://www.securityfocus.com/bid/95157
https://security.gentoo.org/glsa/201701-74
https://usn.ubuntu.com/3712-1/
https://usn.ubuntu.com/3712-2/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.