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).

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - tar: Bypassing the extract path name (CVE-2016-6321)

  - 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)

  - GNU Tar through 1.34 has a one-byte out-of-bounds read that results in use of uninitialized memory for a     conditional jump. Exploitation to change the flow of control has not been demonstrated. The issue occurs     in from_header in list.c via a V7 archive in which mtime has approximately 11 whitespace characters.
    (CVE-2022-48303)

  - In GNU tar before 1.35, mishandled extension attributes in a PAX archive can lead to an application crash     in xheader.c. (CVE-2023-39804)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - tar: Bypassing the extract path name (CVE-2016-6321)

  - 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 has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - tar: Bypassing the extract path name (CVE-2016-6321)

  - 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 on the package manager's report that the package is installed.

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.

  - 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 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 / 20.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4692-1 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.

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.

An update of the tar package has been released.

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
195646	RHEL 6 : tar (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
195620	RHEL 5 : tar (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
195608	RHEL 7 : tar (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
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	medium
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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CVE-2018-20482

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