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amazonAmazonALAS2-2019-1362
HistoryNov 11, 2019 - 5:41 p.m.

Medium: openssl

2019-11-1117:41:00
alas.aws.amazon.com
28

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

6.5

Confidence

High

EPSS

0.01

Percentile

83.8%

Issue Overview:

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable “non-stitched” ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q). (CVE-2019-1559)

The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p). (CVE-2018-0734)

Affected Packages:

openssl

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 openssl to update your system.

New Packages:

aarch64:  
    openssl-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-libs-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-devel-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-static-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-perl-1.0.2k-19.amzn2.0.1.aarch64  
    openssl-debuginfo-1.0.2k-19.amzn2.0.1.aarch64  
  
i686:  
    openssl-1.0.2k-19.amzn2.0.1.i686  
    openssl-libs-1.0.2k-19.amzn2.0.1.i686  
    openssl-devel-1.0.2k-19.amzn2.0.1.i686  
    openssl-static-1.0.2k-19.amzn2.0.1.i686  
    openssl-perl-1.0.2k-19.amzn2.0.1.i686  
    openssl-debuginfo-1.0.2k-19.amzn2.0.1.i686  
  
src:  
    openssl-1.0.2k-19.amzn2.0.1.src  
  
x86_64:  
    openssl-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-libs-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-devel-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-static-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-perl-1.0.2k-19.amzn2.0.1.x86_64  
    openssl-debuginfo-1.0.2k-19.amzn2.0.1.x86_64  

Additional References

Red Hat: CVE-2018-0734, CVE-2019-1559

Mitre: CVE-2018-0734, CVE-2019-1559

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

6.5

Confidence

High

EPSS

0.01

Percentile

83.8%