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amazonAmazonALAS2-2019-1301
HistorySep 30, 2019 - 10:47 p.m.

Medium: libxml2

2019-09-3022:47:00
alas.aws.amazon.com
32

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.8 High

AI Score

Confidence

High

10 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.019 Low

EPSS

Percentile

88.4%

Issue Overview:

xpointer.c in libxml2 before 2.9.5 (as used in Apple iOS before 10, OS X before 10.12, tvOS before 10, and watchOS before 3, and other products) does not forbid namespace nodes in XPointer ranges, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free and memory corruption) via a crafted XML document. (CVE-2016-4658)

parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a ‘%’ character in a DTD name. (CVE-2017-16931)

Affected Packages:

libxml2

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 libxml2 to update your system.

New Packages:

aarch64:  
    libxml2-2.9.1-6.amzn2.3.3.aarch64  
    libxml2-devel-2.9.1-6.amzn2.3.3.aarch64  
    libxml2-static-2.9.1-6.amzn2.3.3.aarch64  
    libxml2-python-2.9.1-6.amzn2.3.3.aarch64  
    libxml2-debuginfo-2.9.1-6.amzn2.3.3.aarch64  
  
i686:  
    libxml2-2.9.1-6.amzn2.3.3.i686  
    libxml2-devel-2.9.1-6.amzn2.3.3.i686  
    libxml2-static-2.9.1-6.amzn2.3.3.i686  
    libxml2-python-2.9.1-6.amzn2.3.3.i686  
    libxml2-debuginfo-2.9.1-6.amzn2.3.3.i686  
  
src:  
    libxml2-2.9.1-6.amzn2.3.3.src  
  
x86_64:  
    libxml2-2.9.1-6.amzn2.3.3.x86_64  
    libxml2-devel-2.9.1-6.amzn2.3.3.x86_64  
    libxml2-static-2.9.1-6.amzn2.3.3.x86_64  
    libxml2-python-2.9.1-6.amzn2.3.3.x86_64  
    libxml2-debuginfo-2.9.1-6.amzn2.3.3.x86_64  

Additional References

Red Hat: CVE-2016-4658, CVE-2017-16931

Mitre: CVE-2016-4658, CVE-2017-16931

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.8 High

AI Score

Confidence

High

10 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.019 Low

EPSS

Percentile

88.4%