PT-2021-4098 · Libyang+2 · Libyang+2

Zounathan · Published 2021-03-08 · Updated 2022-09-12 · CVE-2021-28903

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions libyang versions prior to 1.0.225

Description The issue is related to a stack overflow in the libyang library, which can cause a denial of service. This occurs due to uncontrolled recursion of the lyxml parse elem() function when lyxml parse mem() is called. The exploitation of this issue can allow a remote attacker to cause a denial of service.

Recommendations For versions prior to 1.0.225, update to version 1.0.225 or later to resolve the issue. As a temporary workaround, consider restricting the use of the lyxml parse mem() function until a patch is available.

Exploit

Fix

DoS

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

BDU:2021-04681

CVE-2021-28903

OPENSUSE-SU-2022_3245-1

SUSE-SU-2022:3245-1

Affected Products

Debian

Suse

Libyang

References · 22

• 🔥 https://github.com/CESNET/libyang/issues/1453 · Exploit
• 🔥❌ https://github.com/AlAIAL90/CVE-2021-28903 · Exploit, Deleted
• https://security-tracker.debian.org/tracker/CVE-2021-28903 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-28903 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-28903 · Vendor Advisory
• https://security.gentoo.org/glsa/202107-54 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-28903 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2022:3245-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-28903 · Security Note
• https://bdu.fstec.ru/vul/2021-04681 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-28903 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-28903 · Security Note
• https://bugzilla.suse.com/1186374 · Note
• https://bugzilla.suse.com/1186378 · Note
• https://t.me/cybersecuritytechnologies/3916 · Telegram Post