#VU51932 Out-of-bounds read in OpenEXR - CVE-2021-3477

Vulnerability identifier: #VU51932

Vulnerability risk: Medium

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

CVE-ID: CVE-2021-3477

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenEXR
Client/Desktop applications / Multimedia software

Vendor: OpenEXR

Description

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

The vulnerability exists due to a boundary condition within the deep tile sample size calculations. A remote attacker can create a specially crafted file, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenEXR: 1.0.4 - 2.5.5

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External links
http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26956
http://bugzilla.redhat.com/show_bug.cgi?id=1939159
http://github.com/AcademySoftwareFoundation/openexr/releases/tag/v2.4.3

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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.