PT-2021-6494 · Libsixel+1 · Libsixel+1

Suhwansong · Published 2020-09-30 · Updated 2024-12-20 · CVE-2020-21547

Positive Technologies (AI Summary)

CVSS v2.0

10

High

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Libsixel version 1.8.2

Description The issue is related to a heap-based buffer overflow in the dither func fs function in tosixel.c. This can be exploited by a remote attacker to access confidential data, compromise data integrity, and cause a denial of service.

Recommendations For Libsixel version 1.8.2, consider disabling the dither func fs function as a temporary workaround until a patch is available. Restrict access to the tosixel.c component to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this issue.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALT-PU-2020-2902

ALT-PU-2024-17256

BDU:2022-01744

CVE-2020-21547

Affected Products

Alt Linux

Libsixel

References · 12

• 🔥 https://github.com/saitoha/libsixel/issues/114 · Exploit
• https://security-tracker.debian.org/tracker/CVE-2020-21547 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-21547 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-21547 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-21547 · Security Note
• https://bdu.fstec.ru/vul/2022-01744 · Security Note
• https://osv.dev/vulnerability/CVE-2020-21547 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-21547 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-21547 · Security Note
• https://github.com/saitoha/libsixel/commit/9d0a7ff417b66d80a4bff714de1f27b24742f55a · Note
• https://t.me/cvenotify/21630 · Telegram Post
• https://t.me/cibsecurity/29079 · Telegram Post