CVE-2020-23856: Use After Free
First published: Tue May 18 2021(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GNU cflow | =1.6 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- 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/
- https://lists.gnu.org/archive/html/bug-cflow/2020-07/msg00000.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZTTKZX274BVFZX7TMPEZG6UWL6UPMQF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BLSXGFK2NYPCJMPHSHE3W56ZU3ZO6RD7/
Frequently Asked Questions
What is the severity of CVE-2020-23856?
The severity of CVE-2020-23856 is medium with a CVSS score of 5.5.
What is CVE-2020-23856?
CVE-2020-23856 is a use-after-free vulnerability in cflow 1.6 that can cause a denial of service.
How does CVE-2020-23856 affect cflow 1.6?
CVE-2020-23856 affects cflow 1.6 by exploiting a use-after-free vulnerability in the void call(char *name, int line) function at src/parser.c.
How can I fix CVE-2020-23856?
To fix CVE-2020-23856, update cflow to a version that has addressed the vulnerability.
Are there any references for CVE-2020-23856?
Yes, you can find references for CVE-2020-23856 at the following links: [LINKS]
- collector/nvd-index
- agent/severity
- agent/references
- agent/author
- agent/weakness
- agent/event
- agent/type
- agent/description
- agent/last-modified-date
- agent/softwarecombine
- agent/first-publish-date
- agent/tags
- collector/mitre-cve
- source/MITRE
- vendor/gnu
- canonical/gnu cflow
- version/gnu cflow/1.6
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34