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Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : PEAR vulnerabilities (USN-4654-1)

high Nessus Plugin ID 143428

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4654-1 advisory.

 - Archive_Tar through 1.4.10 allows an unserialization attack because phar: is blocked but PHAR: is not blocked. (CVE-2020-28948)

 - Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as file:// to overwrite files) can still succeed. (CVE-2020-28949)

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

Solution

Update the affected php-pear package.

See Also

https://ubuntu.com/security/notices/USN-4654-1

Plugin Details

Severity: High

ID: 143428

File Name: ubuntu_USN-4654-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 12/2/2020

Updated: 10/20/2023

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2020-28949

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:php-pear

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/1/2020

Vulnerability Publication Date: 11/19/2020

CISA Known Exploited Vulnerability Due Dates: 9/15/2022

Exploitable With

Metasploit (PEAR Archive_Tar 1.4.10 Arbitrary File Write)

Reference Information

CVE: CVE-2020-28948, CVE-2020-28949

USN: 4654-1