PT-2021-6548 · Libelfin+1 · Libelfin+1

Published 2021-08-04 · Updated 2021-08-10 · CVE-2020-24821

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 Libelfin version 0.3

Description The issue is related to the dwarf::cursor::skip form function in Libelfin, which can be exploited by attackers to cause a denial of service (DOS) through a segmentation fault. This can be achieved by using a crafted ELF file. The vulnerability is associated with insufficient neutralization of special elements in the request, allowing a remote attacker to disrupt service.

Recommendations For Libelfin version 0.3, consider disabling the dwarf::cursor::skip form function as a temporary workaround until a patch is available. Restrict access to the dwarf::cursor::skip form function to minimize the risk of exploitation. Avoid using crafted ELF files that could trigger the denial of service.

Exploit

Fix

DoS

Special Elements Injection

Weakness Enumeration

CWE-74

Related Identifiers

BDU:2022-01809

CVE-2020-24821

Affected Products

Debian

Libelfin

References · 11

• 🔥 https://github.com/aclements/libelfin/issues/52 · Exploit
• 🔥❌ https://github.com/xiaoxiongwang/function_bugs/tree/master/libelfin#segv-in-function-dwarfcursorskip_form-at-dwarfcursorcc191 · Exploit, Deleted
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-24821 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-01809 · Security Note
• https://ubuntu.com/security/CVE-2020-24821 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-24821 · Security Note
• https://cve.org/CVERecord?id=CVE-2020-24821 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-24821 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-24821 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-24821 · Vendor Advisory
• https://t.me/cibsecurity/26808 · Telegram Post