Use After Free in Openatom Openeuler
CVE-2021-33640
After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the released memory is used (use-after-free).
Vulnerability class: Use-After-Free
EPSS: 0.006 (47.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Openatom Openeuler — versions 20.03, 22.03
- Openeuler 20.03 Lts Sp1 — versions libtar 1.2.20-19
- Openeuler 20.03 Lts Sp3 — versions libtar 1.2.20-19
- Openeuler 22.03 Lts — versions libtar 1.2.20-21
- Fedoraproject Fedora — versions 36, 37
Weakness classification (CWE)
References
- securities@openeuler.org (Vendor Advisory)
- securities@openeuler.org (vendor-advisory)
- securities@openeuler.org (vendor-advisory)
Frequently asked questions
- What is CVE-2021-33640?
- CVE-2021-33640 is a medium-severity vulnerability in Openatom Openeuler, classified under Use After Free. CVSS score: 6.2/10. Published 2022-12-19.
- How severe is CVE-2021-33640?
- Medium severity. CVSS v3 base score is 6.2 out of 10.