#VU28005 Division by zero in libexif - CVE-2020-12767

Vulnerability identifier: #VU28005

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-12767

CWE-ID: CWE-369

Exploitation vector: Local

Exploit availability: No

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

Vendor: libexif.sourceforge.net

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to division by zero error in "exif_entry_get_value" in the "exif-entry.c" file. A local user can cause a denial of service condition on the target system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libexif: 0.6.21

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External links
https://github.com/libexif/libexif/issues/31
https://lists.debian.org/debian-lts-announce/2020/05/msg00016.html
https://usn.ubuntu.com/4358-1/
https://github.com/libexif/libexif/releases/tag/libexif-0_6_22-release

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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