Vulnerability-Lookup

VAR-202208-0889

Vulnerability from variot - Updated: 2023-12-18 11:55

An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read. feep.net of libtar Products from other vendors have out-of-bounds read vulnerabilities.Information is obtained and service operation is interrupted (DoS) It may be in a state. openEuler is an operating system of the Open Atom Open Source Foundation. There are security vulnerabilities in openEuler 20.03-LTS-SP1, 20.03-LTS-SP3, and 22.03-LTS versions of the Open Atom Open Source Foundation. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

====================================================================
Red Hat Security Advisory

Synopsis: Moderate: libtar security update Advisory ID: RHSA-2023:2898-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2023:2898 Issue date: 2023-05-16 CVE Names: CVE-2021-33643 CVE-2021-33644 CVE-2021-33645 CVE-2021-33646 ==================================================================== 1. Summary:

An update for libtar is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Relevant releases/architectures:

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Description:

The libtar packages contain a C library for manipulating tar archives. The library supports both the strict POSIX tar format and many of the commonly used GNU extensions.

Security Fix(es):

libtar: out-of-bounds read in gnu_longlink (CVE-2021-33643)
libtar: out-of-bounds read in gnu_longname (CVE-2021-33644)
libtar: memory leak found in th_read() function (CVE-2021-33645)
libtar: memory leak found in th_read() function (CVE-2021-33646)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.8 Release Notes linked from the References section.

Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Bugs fixed (https://bugzilla.redhat.com/):

2121289 - CVE-2021-33643 libtar: out-of-bounds read in gnu_longlink 2121292 - CVE-2021-33644 libtar: out-of-bounds read in gnu_longname 2121295 - CVE-2021-33645 libtar: memory leak found in th_read() function 2121297 - CVE-2021-33646 libtar: memory leak found in th_read() function

Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source: libtar-1.2.20-17.el8.src.rpm

aarch64: libtar-1.2.20-17.el8.aarch64.rpm libtar-debuginfo-1.2.20-17.el8.aarch64.rpm libtar-debugsource-1.2.20-17.el8.aarch64.rpm

ppc64le: libtar-1.2.20-17.el8.ppc64le.rpm libtar-debuginfo-1.2.20-17.el8.ppc64le.rpm libtar-debugsource-1.2.20-17.el8.ppc64le.rpm

s390x: libtar-1.2.20-17.el8.s390x.rpm libtar-debuginfo-1.2.20-17.el8.s390x.rpm libtar-debugsource-1.2.20-17.el8.s390x.rpm

x86_64: libtar-1.2.20-17.el8.i686.rpm libtar-1.2.20-17.el8.x86_64.rpm libtar-debuginfo-1.2.20-17.el8.i686.rpm libtar-debuginfo-1.2.20-17.el8.x86_64.rpm libtar-debugsource-1.2.20-17.el8.i686.rpm libtar-debugsource-1.2.20-17.el8.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/

References:

https://access.redhat.com/security/cve/CVE-2021-33643 https://access.redhat.com/security/cve/CVE-2021-33644 https://access.redhat.com/security/cve/CVE-2021-33645 https://access.redhat.com/security/cve/CVE-2021-33646 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.8_release_notes/index

Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

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There are security vulnerabilities in openEuler 20.03-LTS-SP1, 20.03-LTS-SP3, and 22.03-LTS versions of the Open Atom Open Source Foundation. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n====================================================================                   \nRed Hat Security Advisory\n\nSynopsis:          Moderate: libtar security update\nAdvisory ID:       RHSA-2023:2898-01\nProduct:           Red Hat Enterprise Linux\nAdvisory URL:      https://access.redhat.com/errata/RHSA-2023:2898\nIssue date:        2023-05-16\nCVE Names:         CVE-2021-33643 CVE-2021-33644 CVE-2021-33645\n                   CVE-2021-33646\n====================================================================\n1. Summary:\n\nAn update for libtar is now available for Red Hat Enterprise Linux 8. \n\nRed Hat Product Security has rated this update as having a security impact\nof Moderate. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64\n\n3. Description:\n\nThe libtar packages contain a C library for manipulating tar archives. The\nlibrary supports both the strict POSIX tar format and many of the commonly\nused GNU extensions. \n\nSecurity Fix(es):\n\n* libtar: out-of-bounds read in gnu_longlink (CVE-2021-33643)\n\n* libtar: out-of-bounds read in gnu_longname (CVE-2021-33644)\n\n* libtar: memory leak found in th_read() function (CVE-2021-33645)\n\n* libtar: memory leak found in th_read() function (CVE-2021-33646)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat\nEnterprise Linux 8.8 Release Notes linked from the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n2121289 - CVE-2021-33643 libtar: out-of-bounds read in gnu_longlink\n2121292 - CVE-2021-33644 libtar: out-of-bounds read in gnu_longname\n2121295 - CVE-2021-33645 libtar: memory leak found in th_read() function\n2121297 - CVE-2021-33646 libtar: memory leak found in th_read() function\n\n6. Package List:\n\nRed Hat Enterprise Linux AppStream (v. 8):\n\nSource:\nlibtar-1.2.20-17.el8.src.rpm\n\naarch64:\nlibtar-1.2.20-17.el8.aarch64.rpm\nlibtar-debuginfo-1.2.20-17.el8.aarch64.rpm\nlibtar-debugsource-1.2.20-17.el8.aarch64.rpm\n\nppc64le:\nlibtar-1.2.20-17.el8.ppc64le.rpm\nlibtar-debuginfo-1.2.20-17.el8.ppc64le.rpm\nlibtar-debugsource-1.2.20-17.el8.ppc64le.rpm\n\ns390x:\nlibtar-1.2.20-17.el8.s390x.rpm\nlibtar-debuginfo-1.2.20-17.el8.s390x.rpm\nlibtar-debugsource-1.2.20-17.el8.s390x.rpm\n\nx86_64:\nlibtar-1.2.20-17.el8.i686.rpm\nlibtar-1.2.20-17.el8.x86_64.rpm\nlibtar-debuginfo-1.2.20-17.el8.i686.rpm\nlibtar-debuginfo-1.2.20-17.el8.x86_64.rpm\nlibtar-debugsource-1.2.20-17.el8.i686.rpm\nlibtar-debugsource-1.2.20-17.el8.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security.  Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2021-33643\nhttps://access.redhat.com/security/cve/CVE-2021-33644\nhttps://access.redhat.com/security/cve/CVE-2021-33645\nhttps://access.redhat.com/security/cve/CVE-2021-33646\nhttps://access.redhat.com/security/updates/classification/#moderate\nhttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.8_release_notes/index\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. 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CVE-2021-33643 (GCVE-0-2021-33643)

Vulnerability from cvelistv5 – Published: 2022-08-09 00:00 – Updated: 2026-06-23 14:42

Summary

An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-23 14:41 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

openEuler mitre root

References

7 references

URL	Tags
https://www.openeuler.org/en/security/safety-bull…
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

1 product

Vendor	Product	Version
n/a	libtar	Affected: <1.2.21

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

VAR-202208-0889

CVE-2021-33643 (GCVE-0-2021-33643)

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