GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).

GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows     local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by     modifying a file that is supposed to be archived by a different user's process (e.g., a system backup     running as root). (CVE-2018-20482)

Note that Nessus relies on the presence of the package as reported by the vendor.

An update of the tar package has been released.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:1548-1 advisory.

  - GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows     local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by     modifying a file that is supposed to be archived by a different user's process (e.g., a system backup     running as root). (CVE-2018-20482)

  - pax_decode_header in sparse.c in GNU Tar before 1.32 had a NULL pointer dereference when parsing certain     archives that have malformed extended headers. (CVE-2019-9923)

  - A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a     crafted input file to tar to cause uncontrolled consumption of memory. The highest threat from this     vulnerability is to system availability. (CVE-2021-20193)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 9 host has packages installed that are affected by a vulnerability as referenced in the dla-2830 advisory.

    An infinite loop when --sparse is used with file shrinkage during read access was fixed in the GNU tar     archiving utility. For Debian 9 stretch, this problem has been fixed in version 1.29b-1.1+deb9u1. We     recommend that you upgrade your tar packages. For the detailed security status of tar please refer to its     security tracker page at: https://security-tracker.debian.org/tracker/tar Further information about Debian     LTS security advisories, how to apply these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES11 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2019:14215-1 advisory.

  - GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows     local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by     modifying a file that is supposed to be archived by a different user's process (e.g., a system backup     running as root). (CVE-2018-20482)

  - pax_decode_header in sparse.c in GNU Tar before 1.32 had a NULL pointer dereference when parsing certain     archives that have malformed extended headers. (CVE-2019-9923)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4692-1 advisory.

    Chris Siebenmann discovered that tar incorrectly handled extracting files resized during extraction when     invoked with the --sparse flag. An attacker could possibly use this issue to cause a denial of service.
    This issue only affected Ubuntu 12.04 ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
    (CVE-2018-20482)

    Daniel Axtens discovered that tar incorrectly handled certain malformed tar files. If a user or automated     system were tricked into processing a specially crafted tar archive, a remote attacker could use this     issue to cause tar to crash, resulting in a denial of service. (CVE-2019-9923)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for tar fixes the following issues :

Security issues fixed :

CVE-2019-9923: Fixed a denial of service while parsing certain archives with malformed extended headers in pax_decode_header() (bsc#1130496).

CVE-2018-20482: Fixed a denial of service when the '--sparse' option mishandles file shrinkage during read access (bsc#1120610).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version of the tar package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - The GNU tar program saves many files together in one     archive and can restore individual files (or all of the     files) from that archive. Tar can also be used to add     supplemental files to an archive and to update or list     files in the archive. Tar includes multivolume support,     automatic archive compression/decompression, the     ability to perform remote archives, and the ability to     perform incremental and full backups. If you want to     use tar for remote backups, you also need to install     the rmt package on the remote box. Security Fix(es):GNU     Tar through 1.30, when --sparse is used, mishandles     file shrinkage during read access, which allows local     users to cause a denial of service (infinite read loop     in sparse_dump_region in sparse.c) by modifying a file     that is supposed to be archived by a different user's     process (e.g., a system backup running as     root).(CVE-2018-20482)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version of the tar package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - The GNU tar program saves many files together in one     archive and can restore individual files (or all of the     files) from that archive. Tar can also be used to add     supplemental files to an archive and to update or list     files in the archive. Tar includes multivolume support,     automatic archive compression/decompression, the     ability to perform remote archives, and the ability to     perform incremental and full backups. If you want to     use tar for remote backups, you also need to install     the rmt package on the remote box.Security Fix(es):GNU     Tar through 1.30, when --sparse is used, mishandles     file shrinkage during read access, which allows local     users to cause a denial of service (infinite read loop     in sparse_dump_region in sparse.c) by modifying a file     that is supposed to be archived by a different user's     process (e.g., a system backup running as     root).(CVE-2018-20482)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version of the tar package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - tar: Infinite read loop in sparse_dump_region function     in sparse.c.(CVE-2018-20482)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for tar fixes the following issues :

Security issues fixed :

  - CVE-2019-9923: Fixed a denial of service while parsing     certain archives with malformed extended headers in     pax_decode_header() (bsc#1130496).

  - CVE-2018-20482: Fixed a denial of service when the     '--sparse' option mishandles file shrinkage during read     access (bsc#1120610).

This update was imported from the SUSE:SLE-15:Update update project.

According to the version of the tar package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerability :

  - GNU Tar through 1.30, when --sparse is used, mishandles     file shrinkage during read access, which allows local     users to cause a denial of service (infinite read loop     in sparse_dump_region in sparse.c) by modifying a file     that is supposed to be archived by a different user's     process (e.g., a system backup running as     root).i1/4^CVE-2018-20482i1/4%0

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version of the tar package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - GNU Tar through 1.30, when --sparse is used, mishandles     file shrinkage during read access, which allows local     users to cause a denial of service (infinite read loop     in sparse_dump_region in sparse.c) by modifying a file     that is supposed to be archived by a different user's     process (e.g., a system backup running as     root).(CVE-2018-20482)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201903-05 (Tar: Denial of service)

    The sparse_dump_region function in sparse.c file in Tar allows an       infinite loop using the --sparse option.
  Impact :

    A local attacker could cause a Denial of Service condition by modifying       a file that is supposed to be archived by a different user&rsquo;s process       (e.g., a system backup running as root).
  Workaround :

    There is no known workaround at this time.

It was discovered that there was a potential denial of service vulnerability in tar, the GNU version of the tar UNIX archiving utility.

The --sparse argument looped endlessly if the file shrank whilst it was being read. Tar would only break out of this endless loop if the file grew again to (or beyond) its original end of file.

For Debian 8 'Jessie', this issue has been fixed in tar version 1.27.1-2+deb8u2.

We recommend that you upgrade your tar packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
504209	Siemens SIMATIC S7-1500 Loop with Unreachable Exit Condition (CVE-2018-20482)	Tenable OT Security	Tenable.ot	medium
222350	Linux Distros Unpatched Vulnerability : CVE-2018-20482	Nessus	Misc.	medium
202880	Photon OS 2.0: Tar PHSA-2019-2.0-0161	Nessus	PhotonOS Local Security Checks	medium
202772	Photon OS 3.0: Tar PHSA-2019-3.0-0016	Nessus	PhotonOS Local Security Checks	medium
160664	SUSE SLED15 / SLES15 Security Update : tar (SUSE-SU-2022:1548-1)	Nessus	SuSE Local Security Checks	high
155707	Debian DLA-2830-1 : tar - LTS security update	Nessus	Debian Local Security Checks	critical
150619	SUSE SLES11 Security Update : tar (SUSE-SU-2019:14215-1)	Nessus	SuSE Local Security Checks	high
144944	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : tar vulnerabilities (USN-4692-1)	Nessus	Ubuntu Local Security Checks	high
143630	SUSE SLES12 Security Update : tar (SUSE-SU-2020:2806-1)	Nessus	SuSE Local Security Checks	high
132822	EulerOS Virtualization for ARM 64 3.0.5.0 : tar (EulerOS-SA-2020-1068)	Nessus	Huawei Local Security Checks	medium
132628	EulerOS 2.0 SP8 : tar (EulerOS-SA-2020-1035)	Nessus	Huawei Local Security Checks	medium
126124	Photon OS 1.0: Tar PHSA-2019-1.0-0236	Nessus	PhotonOS Local Security Checks	medium
124632	EulerOS 2.0 SP3 : tar (EulerOS-SA-2019-1346)	Nessus	Huawei Local Security Checks	medium
124188	openSUSE Security Update : tar (openSUSE-2019-1237)	Nessus	SuSE Local Security Checks	high
123995	SUSE SLED15 / SLES15 Security Update : tar (SUSE-SU-2019:0926-1)	Nessus	SuSE Local Security Checks	high
123730	EulerOS Virtualization 2.5.3 : tar (EulerOS-SA-2019-1262)	Nessus	Huawei Local Security Checks	medium
123628	EulerOS 2.0 SP5 : tar (EulerOS-SA-2019-1154)	Nessus	Huawei Local Security Checks	medium
123603	EulerOS 2.0 SP2 : tar (EulerOS-SA-2019-1129)	Nessus	Huawei Local Security Checks	medium
122733	GLSA-201903-05 : Tar: Denial of service	Nessus	Gentoo Local Security Checks	medium
119957	Debian DLA-1623-1 : tar security update	Nessus	Debian Local Security Checks	medium

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