PT-2019-6204 · Libsixel · Libsixel

Suhwansong · Published 2019-12-24 · Updated 2021-08-17 · CVE-2020-21677

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Libsixel version 1.8.4

Description A heap-based buffer overflow in the sixel encoder output without macro function in encoder.c of Libsixel allows attackers to cause a denial of service (DOS) via converting a crafted PNG file into Sixel format.

Recommendations For Libsixel version 1.8.4, consider disabling the sixel encoder output without macro function until a patch is available to prevent exploitation. 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:2022-02088

CVE-2020-21677

Affected Products

Libsixel

References · 11

• 🔥 https://github.com/saitoha/libsixel/issues/123 · Exploit
• https://bdu.fstec.ru/vul/2022-02088 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2020-21677 · Security Note
• https://ubuntu.com/security/CVE-2020-21677 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-21677 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-21677 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-21677 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-21677 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-21677 · Vendor Advisory
• https://github.com/saitoha/libsixel/commit/0b1e0b3f7b44233f84e5c9f512f8c90d6bbbe33d · Note
• https://t.me/cibsecurity/27098 · Telegram Post