CVE-2021-36976: libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block)

Medium severity · published Jul 20, 2021

CVE-2021-36976

libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block)

6.5

CVSS

2.8%

EPSS

On KEV

Description

libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

Required

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)2.8% · higher than 87% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

iOS · Apple

before 15.4 · source: NVD

macOS · Apple

before 12.3 · source: NVD

Fedora · Fedoraproject

35 · source: NVD

Libarchive · Libarchive

3.4.1 through 3.5.2 · source: NVD

Universal Forwarder · Splunk

8.2.0 before 8.2.12; 9.0.0 before 9.0.6; 9.1.0 · source: NVD

Watchos · Apple

before 8.5 · source: NVD

Affected product

iOS

Apple

All iOS CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-36976

CVE.org

https://www.cve.org/CVERecord?id=CVE-2021-36976

Mailing List

http://seclists.org/fulldisclosure/2022/Mar/27

Mailing List

http://seclists.org/fulldisclosure/2022/Mar/28

Mailing List

http://seclists.org/fulldisclosure/2022/Mar/29

Issue Tracking

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375

Third Party Advisory

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libarchive/OSV-2021-557.yaml

Mailing List

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SE5NJQNM22ZE5Z55LPAGCUHSBQZBKMKC/