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amazonAmazonALAS2-2021-1584
HistoryJan 05, 2021 - 11:34 p.m.

Medium: php-pear

2021-01-0523:34:00
alas.aws.amazon.com
23
archive_tar
unserialization attack
filename sanitization
php-pear
cve-2020-28948
cve-2020-28949
yum update

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

7.9

Confidence

High

EPSS

0.935

Percentile

99.1%

JSON

Issue Overview:

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)

Affected Packages:

php-pear

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update php-pear to update your system.

New Packages:

noarch:  
    php-pear-1.10.12-4.amzn2.0.1.noarch  
  
src:  
    php-pear-1.10.12-4.amzn2.0.1.src

Additional References

Red Hat: CVE-2020-28948, CVE-2020-28949

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

OSVersionArchitecturePackageVersionFilename
Amazon Linux2noarchphp-pear< 1.10.12-4.amzn2.0.1php-pear-1.10.12-4.amzn2.0.1.noarch.rpm

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CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

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Attack Vector

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Attack Complexity

LOW

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User Interaction

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Scope

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HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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AI Score

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Confidence

High

EPSS

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Percentile

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JSON
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