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[email protected]CVE-2021-32842

HistoryJan 26, 2022 - 9:15 p.m.

CVE-2021-32842

2022-01-2621:15:13

CWE-22

[email protected]

web.nvd.nist.gov

sharpziplib

#ziplib

arbitrary file creation

file directory vulnerability

cve-2021-32842

zip library

gzip library

tar library

bzip2 library

5 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

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

5.2 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

30.9%

JSON

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.0.0 and prior to version 1.3.3, a check was added if the destination file is under a destination directory. However, it is not enforced that _baseDirectory ends with slash. If the _baseDirectory is not slash terminated like /home/user/dir it is possible to create a file with a name thats begins as the destination directory one level up from the directory, i.e. /home/user/dir.sh. Because of the file name and destination directory constraints, the arbitrary file creation impact is limited and depends on the use case. Version 1.3.3 fixed this vulnerability.

Affected configurations

Vulners

NVD

Node

icsharpcodesharpziplibRange<1.3.3

icsharpcodesharpziplibRange<1.0.0*

CPENameOperatorVersion
sharpziplib_project:sharpziplibsharpziplib project sharpzipliblt1.3.3

CPE	Name	Operator	Version
sharpziplib_project:sharpziplib	sharpziplib project sharpziplib	lt	1.3.3

CNA Affected

[
  {
    "product": "sharpziplib",
    "vendor": "icsharpcode",
    "versions": [
      {
        "lessThan": "1.3.3",
        "status": "affected",
        "version": "1.3.3",
        "versionType": "custom"
      },
      {
        "lessThan": "1.0.0*",
        "status": "affected",
        "version": "1.0.0",
        "versionType": "custom"
      }
    ]
  }
]