PT-2021-6728 · Libelfin+1 · Libelfin+1

Published 2021-08-04 · Updated 2021-08-10 · CVE-2020-24822

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 A vulnerability in the dwarf::cursor::uleb function allows attackers to cause a denial of service (DOS) through a segmentation fault via a crafted ELF file. The issue is related to insufficient neutralization of special elements in a request, which can be exploited by a remote attacker to cause a denial of service using a specially crafted ELF file.

Recommendations For Libelfin version 0.3, consider disabling the dwarf::cursor::uleb function as a temporary workaround until a patch is available. Restrict access to the dwarf::cursor::uleb function to minimize the risk of exploitation. Avoid using specially crafted ELF files that can trigger the denial of service. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Special Elements Injection

Weakness Enumeration

CWE-74

Related Identifiers

BDU:2022-02098

CVE-2020-24822

Affected Products

Debian

Libelfin

References · 11

• 🔥 https://github.com/aclements/libelfin/issues/50 · Exploit
• 🔥❌ https://github.com/xiaoxiongwang/function_bugs/tree/master/libelfin#segv-in-function-dwarfcursoruleb128-at-dwarfinternalhh154 · Exploit, Deleted
• https://nvd.nist.gov/vuln/detail/CVE-2020-24822 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-24822 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-02098 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-24822 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-24822 · Security Note
• https://ubuntu.com/security/CVE-2020-24822 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-24822 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-24822 · Vendor Advisory
• https://t.me/cibsecurity/26800 · Telegram Post