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amazonAmazonALAS-2022-1588
HistoryMay 31, 2022 - 11:47 p.m.

Medium: expat

2022-05-3123:47:00
alas.aws.amazon.com
12

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.01 Low

EPSS

Percentile

83.6%

JSON

Issue Overview:

In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory). (CVE-2021-45960)

Affected Packages:

expat

Issue Correction:
Run yum update expat to update your system.

New Packages:

i686:  
    expat-2.1.0-12.28.amzn1.i686  
    expat-debuginfo-2.1.0-12.28.amzn1.i686  
    expat-devel-2.1.0-12.28.amzn1.i686  
  
src:  
    expat-2.1.0-12.28.amzn1.src  
  
x86_64:  
    expat-debuginfo-2.1.0-12.28.amzn1.x86_64  
    expat-devel-2.1.0-12.28.amzn1.x86_64  
    expat-2.1.0-12.28.amzn1.x86_64

Additional References

Red Hat: CVE-2021-45960

Mitre: CVE-2021-45960

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8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.01 Low

EPSS

Percentile

83.6%

JSON
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