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amazonAmazonALAS-2016-749
HistorySep 22, 2016 - 4:00 p.m.

Important: openssl

2016-09-2216:00:00
alas.aws.amazon.com
54

CVSS2

7.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

CVSS3

7.5

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

EPSS

0.573

Percentile

97.7%

Issue Overview:

A memory leak flaw was found in the way OpenSSL handled TLS status request extension data during session renegotiation. A remote attacker could cause a TLS server using OpenSSL to consume an excessive amount of memory and, possibly, exit unexpectedly after exhausting all available memory, if it enabled OCSP stapling support.

The OpenSSL Security Advisory [22 Sep 2016] ("https://www.openssl.org/news/secadv/20160922.txt) refers to additional CVEs. CVE-2016-6305 does not affect OpenSSL 1.0.1. The remaining CVEs listed will be fixed in a later update.

The OpenSSL Security Advisory [26 Sep 2016] (https://www.openssl.org/news/secadv/20160926.txt) refers to two additional CVEs which do not affect OpenSSL 1.0.1.

(Updated 2016-09-26: Included a reference to the 26 Sep 2016 upstream advisory.)

Affected Packages:

openssl

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

New Packages:

i686:  
    openssl-devel-1.0.1k-15.95.amzn1.i686  
    openssl-debuginfo-1.0.1k-15.95.amzn1.i686  
    openssl-perl-1.0.1k-15.95.amzn1.i686  
    openssl-static-1.0.1k-15.95.amzn1.i686  
    openssl-1.0.1k-15.95.amzn1.i686  
  
src:  
    openssl-1.0.1k-15.95.amzn1.src  
  
x86_64:  
    openssl-static-1.0.1k-15.95.amzn1.x86_64  
    openssl-perl-1.0.1k-15.95.amzn1.x86_64  
    openssl-debuginfo-1.0.1k-15.95.amzn1.x86_64  
    openssl-devel-1.0.1k-15.95.amzn1.x86_64  
    openssl-1.0.1k-15.95.amzn1.x86_64  

Additional References

Red Hat: CVE-2016-6304

Mitre: CVE-2016-6304

CVSS2

7.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

CVSS3

7.5

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

EPSS

0.573

Percentile

97.7%