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amazonAmazonALAS-2018-1098
HistoryOct 30, 2018 - 8:50 p.m.

Medium: openssl

2018-10-3020:50:00
alas.aws.amazon.com
593

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

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

0.05 Low

EPSS

Percentile

92.7%

Issue Overview:

During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack.(CVE-2018-0732 )

Affected Packages:

openssl

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

New Packages:

i686:  
    openssl-perl-1.0.2k-13.111.amzn1.i686  
    openssl-devel-1.0.2k-13.111.amzn1.i686  
    openssl-debuginfo-1.0.2k-13.111.amzn1.i686  
    openssl-1.0.2k-13.111.amzn1.i686  
    openssl-static-1.0.2k-13.111.amzn1.i686  
  
src:  
    openssl-1.0.2k-13.111.amzn1.src  
  
x86_64:  
    openssl-perl-1.0.2k-13.111.amzn1.x86_64  
    openssl-1.0.2k-13.111.amzn1.x86_64  
    openssl-devel-1.0.2k-13.111.amzn1.x86_64  
    openssl-debuginfo-1.0.2k-13.111.amzn1.x86_64  
    openssl-static-1.0.2k-13.111.amzn1.x86_64  

Additional References

Red Hat: CVE-2018-0732

Mitre: CVE-2018-0732

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

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

0.05 Low

EPSS

Percentile

92.7%