PT-2019-6183 · Sisbell · Libsixel

Suhwansong · Published 2019-12-16 · Updated 2021-09-29 · CVE-2020-21548

Positive Technologies (AI Summary)

CVSS v2.0

9.3

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Libsixel version 1.8.3

Description The issue is related to a heap-based buffer overflow in the sixel encode highcolor function in tosixel.c. This can allow a remote attacker to access confidential data, compromise its integrity, and cause a denial of service.

Recommendations For Libsixel version 1.8.3, consider disabling the sixel encode highcolor function as a temporary workaround until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2022-01694

CVE-2020-21548

Affected Products

Libsixel

References · 12

• 🔥 https://github.com/saitoha/libsixel/issues/116 · Exploit
• https://osv.dev/vulnerability/CVE-2020-21548 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-21548 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2020-21548 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-21548 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-21548 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-21548 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-01694 · Security Note
• https://ubuntu.com/security/CVE-2020-21548 · Vendor Advisory
• https://github.com/saitoha/libsixel/commit/9d0a7ff417b66d80a4bff714de1f27b24742f55a · Note
• https://t.me/cvenotify/21631 · Telegram Post
• https://t.me/cibsecurity/29075 · Telegram Post