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

Vulnerability identifier: #VU30559

CSH Severity: Medium

CVSS v4: 6.9 [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]

CVE-ID: CVE-2019-19624

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

OpenCV
Ubuntu
libopencv-contrib4.5d (Ubuntu package)
libopencv-core4.5d (Ubuntu package)
libopencv-dev (Ubuntu package)
libopencv-dnn4.5d (Ubuntu package)
libopencv-flann4.5d (Ubuntu package)
libopencv-imgcodecs4.5d (Ubuntu package)
libopencv-objdetect4.5d (Ubuntu package)
opencv-data (Ubuntu package)
libopencv-core3.2 (Ubuntu package)

Install update from vendor's website.

OpenCV - update to 4.1.1
libopencv-contrib4.5d (Ubuntu package) - update to Ubuntu Pro
libopencv-core4.5d (Ubuntu package) - update to Ubuntu Pro
libopencv-dev (Ubuntu package) - update to Ubuntu Pro
libopencv-dnn4.5d (Ubuntu package) - update to Ubuntu Pro
libopencv-flann4.5d (Ubuntu package) - update to Ubuntu Pro
libopencv-imgcodecs4.5d (Ubuntu package) - update to Ubuntu Pro
libopencv-objdetect4.5d (Ubuntu package) - update to Ubuntu Pro
opencv-data (Ubuntu package) - update to Ubuntu Pro
libopencv-core3.2 (Ubuntu package) - update to Ubuntu Pro

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

• Multiple vulnerabilities in Itseez OpenCV
• Ubuntu update for opencv