Lucene search

K
amazonAmazonALAS2-2020-1534
HistoryOct 22, 2020 - 6:25 p.m.

Medium: libxml2

2020-10-2218:25:00
alas.aws.amazon.com
23

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.8 High

AI Score

Confidence

High

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

0.009 Low

EPSS

Percentile

82.1%

Issue Overview:

xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs. (CVE-2019-19956)

A memory leak was found in the xmlSchemaValidateStream function of libxml2. Applications that use this library may be vulnerable to memory not being freed leading to a denial of service. System availability is the highest threat from this vulnerability. (CVE-2019-20388)

xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation. (CVE-2020-7595)

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.amzn2.5.1.aarch64  
    libxml2-devel-2.9.1-6.amzn2.5.1.aarch64  
    libxml2-static-2.9.1-6.amzn2.5.1.aarch64  
    libxml2-python-2.9.1-6.amzn2.5.1.aarch64  
    libxml2-debuginfo-2.9.1-6.amzn2.5.1.aarch64  
  
i686:  
    libxml2-2.9.1-6.amzn2.5.1.i686  
    libxml2-devel-2.9.1-6.amzn2.5.1.i686  
    libxml2-static-2.9.1-6.amzn2.5.1.i686  
    libxml2-python-2.9.1-6.amzn2.5.1.i686  
    libxml2-debuginfo-2.9.1-6.amzn2.5.1.i686  
  
src:  
    libxml2-2.9.1-6.amzn2.5.1.src  
  
x86_64:  
    libxml2-2.9.1-6.amzn2.5.1.x86_64  
    libxml2-devel-2.9.1-6.amzn2.5.1.x86_64  
    libxml2-static-2.9.1-6.amzn2.5.1.x86_64  
    libxml2-python-2.9.1-6.amzn2.5.1.x86_64  
    libxml2-debuginfo-2.9.1-6.amzn2.5.1.x86_64  

Additional References

Red Hat: CVE-2019-19956, CVE-2019-20388, CVE-2020-7595

Mitre: CVE-2019-19956, CVE-2019-20388, CVE-2020-7595

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.8 High

AI Score

Confidence

High

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

0.009 Low

EPSS

Percentile

82.1%

Related for ALAS2-2020-1534