Lucene search

K
ubuntucveUbuntu.comUB:CVE-2021-32803
HistoryAug 03, 2021 - 12:00 a.m.

CVE-2021-32803

2021-08-0300:00:00
ubuntu.com
ubuntu.com
22

5.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

8.2 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

0.007 Low

EPSS

Percentile

80.2%

The npm package โ€œtarโ€ (aka node-tar) before versions 6.1.2, 5.0.7, 4.4.15,
and 3.2.3 has an arbitrary File Creation/Overwrite vulnerability via
insufficient symlink protection. node-tar aims to guarantee that any file
whose location would be modified by a symbolic link is not extracted. This
is, in part, achieved by ensuring that extracted directories are not
symlinks. Additionally, in order to prevent unnecessary stat calls to
determine whether a given path is a directory, paths are cached when
directories are created. This logic was insufficient when extracting tar
files that contained both a directory and a symlink with the same name as
the directory. This order of operations resulted in the directory being
created and added to the node-tar directory cache. When a directory is
present in the directory cache, subsequent calls to mkdir for that
directory are skipped. However, this is also where node-tar checks for
symlinks occur. By first creating a directory, and then replacing that
directory with a symlink, it was thus possible to bypass node-tar symlink
checks on directories, essentially allowing an untrusted tar file to
symlink into an arbitrary location and subsequently extracting arbitrary
files into that location, thus allowing arbitrary file creation and
overwrite. This issue was addressed in releases 3.2.3, 4.4.15, 5.0.7 and
6.1.2.

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchnode-tar<ย 4.4.10+ds1-2ubuntu1+esm1UNKNOWN
ubuntu14.04noarchnode-tar<ย anyUNKNOWN

5.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

8.2 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

0.007 Low

EPSS

Percentile

80.2%