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gentooGentoo FoundationGLSA-201903-05
HistoryMar 10, 2019 - 12:00 a.m.

Tar: Denial of service

2019-03-1000:00:00
Gentoo Foundation
security.gentoo.org
115

1.9 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:N/I:N/A:P

4.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.0004 Low

EPSS

Percentile

5.1%

Background

The Tar program provides the ability to create and manipulate tar archives.

Description

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’s process (e.g., a system backup running as root).

Workaround

There is no known workaround at this time.

Resolution

All Tar users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-arch/tar-1.30-r1"
OSVersionArchitecturePackageVersionFilename
Gentooanyallapp-arch/tar<Β 1.30-r1UNKNOWN

1.9 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:M/Au:N/C:N/I:N/A:P

4.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.0004 Low

EPSS

Percentile

5.1%