Division by zero in libexif (Alpine package)

1) Division by zero

EUVDB-ID: #VU28005

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 - Divide By Zero

Exploit availability: No

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

IBM Tivoli Storage Manager: 6.1.1

libexif (Alpine package): 0.25

libexif (Alpine package): 2.20160721

libexif (Alpine package): 20100912 - 20101020ubuntu272

libexif (Alpine package): 1.1.20 - 9.20120509

libexif (Alpine package): 7.16.2-4ubuntu1 - 7.16.2-5

libexif (Alpine package): 7.4.3.32

libexif (Alpine package): 9.3

libexif (Alpine package): 1.1

libexif (Alpine package): 8.5

libexif (Alpine package): 4.65

libexif (Alpine package): 0.0.6

libexif (Alpine package):

libexif (Alpine package): before 0.6.22-r0

CPE2.3

• cpe:2.3:a:ibm_corporation:ibm_tivoli_storage_manager:6.1.1:*:*:*:*:*:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:0.25:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:2.20160721:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:20100912:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:20101020ubuntu272:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:1.1.20:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:9.20120509:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:7.16.2-4ubuntu1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:7.16.2-5:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:7.4.3.32:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:9.3:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:1.1:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:8.5:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:4.65:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:0.0.6:*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package::*:*:*:*:alpine_linux:*:*
• cpe:2.3:o:alpine:libexif_alpine_package:*:*:*:*:*:alpine_linux:*:3.8

External links

https://git.alpinelinux.org/aports/commit/?id=5dea23e076ed7123339473f529d74d8a9362e7c6
https://git.alpinelinux.org/aports/commit/?id=726529dabef044127d02831c4b26fa6c6fc9d5f5
https://git.alpinelinux.org/aports/commit/?id=7d1a8137daa5c1f5312ad957dc1857027b8999df
https://git.alpinelinux.org/aports/commit/?id=9959b863135bbaa1251dbddfa038c9256e155702
https://git.alpinelinux.org/aports/commit/?id=cc9c8ab403cd5dfa204be58c326dd98d0702d70c

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.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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