CVE-2020-23856 Information

Description

Use-after-Free vulnerability in cflow 1.6 in the void call(char name int line) function at src/parser.c which could cause a denial of service via the pointer variable caller->callee.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

https://lists.gnu.org/archive/html/bug-cflow/2020-07/msg00000.html https://github.com/yangjiageng/PoC/blob/master/PoC_cflow_uaf_parser_line1284 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BLSXGFK2NYPCJMPHSHE3W56ZU3ZO6RD7/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZTTKZX274BVFZX7TMPEZG6UWL6UPMQF/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5