#VU30559 Out-of-bounds read in OpenCV - CVE-2019-19624

Vulnerability identifier: #VU30559

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-19624

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

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

Vendor: Itseez

Description

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

An out-of-bounds read was discovered in OpenCV before 4.1.1. Specifically, variable coarsest_scale is assumed to be greater than or equal to finest_scale within the calc()/ocl_calc() functions in dis_flow.cpp. However, this is not true when dealing with small images, leading to an out-of-bounds read of the heap-allocated arrays Ux and Uy.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenCV: 4.1.0

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External links
https://access.redhat.com/security/cve/cve-2019-19624
https://github.com/opencv/opencv/commit/d1615ba11a93062b1429fce9f0f638d1572d3418
https://github.com/opencv/opencv/issues/14554

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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.