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CVE-2020-23856

Date: May 18, 2021

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.

Language: C

Severity Score

5.5

Related Resources (10)

Url: https://lists.gnu.org/archive/html/bug-cflow/2020-07/msg00000.html

Url: https://security-tracker.debian.org/tracker/CVE-2020-23856

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2020-23856

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BLSXGFK2NYPCJMPHSHE3W56ZU3ZO6RD7/

Url: https://nvd.nist.gov/vuln/detail/CVE-2020-23856

Url: https://github.com/yangjiageng/PoC/blob/master/PoC_cflow_uaf_parser_line1284

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZTTKZX274BVFZX7TMPEZG6UWL6UPMQF/

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BLSXGFK2NYPCJMPHSHE3W56ZU3ZO6RD7/

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZTTKZX274BVFZX7TMPEZG6UWL6UPMQF/

Url: https://www.mend.io/vulnerability-database/CVE-2020-23856

Severity Score

5.5

Weakness Type (CWE)

Use After Free

CWE-416

CVSS v3.1

Base Score:	5.5
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	LOW
Privileges Required (PR):	LOW
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	HIGH

CVSS v2

Base Score:	2.1
Access Vector (AV):	LOCAL
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	PARTIAL
Additional information:

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