PT-2020-6421 · Cflow+2 · Cflow+2

Published 2020-07-09 · Updated 2023-09-11 · CVE-2020-23856

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions cflow version 1.6

Description The issue is related to a Use-after-Free vulnerability in the call() function at src/parser.c, which could cause a denial of service via the pointer variable caller->callee. This vulnerability may allow an attacker to cause a denial of service.

Recommendations For cflow version 1.6, as a temporary workaround, consider disabling the call() function until a patch is available. Restrict access to the src/parser.c component to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2022-1618

ALT-PU-2022-2442

ALT-PU-2023-5543

BDU:2021-04641

CVE-2020-23856

Affected Products

Alt Linux

Debian

Cflow

References · 13

• 🔥 https://lists.gnu.org/archive/html/bug-cflow/2020-07/msg00000.html · Exploit
• 🔥 https://github.com/yangjiageng/PoC/blob/master/PoC_cflow_uaf_parser_line1284 · Exploit
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BLSXGFK2NYPCJMPHSHE3W56ZU3ZO6RD7 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-23856 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZTTKZX274BVFZX7TMPEZG6UWL6UPMQF · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-23856 · Security Note
• https://ubuntu.com/security/CVE-2020-23856 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-23856 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-23856 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-23856 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-23856 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04641 · Security Note
• https://t.me/cvenotify/15300 · Telegram Post