Amazon Linux 2 : openssl (ALAS-2019-1362)
medium Nessus Plugin ID 131030
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Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
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)
Solution
Run 'yum update openssl' to update your system.See Also
Plugin Details
Severity: Medium
ID: 131030
File Name: al2_ALAS-2019-1362.nasl
Version: 1.2
Type: local
Agent: unix
Published: 11/15/2019
Updated: 12/12/2019
Dependencies: ssh_get_info.nasl
Risk Information
VPR
Risk Factor: Medium
Score: 5.1
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.2
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N
Temporal Vector: E:U/RL:OF/RC:C
CVSS v3
Risk Factor: Medium
Base Score: 5.9
Temporal Score: 5.2
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Temporal Vector: E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:openssl, p-cpe:/a:amazon:linux:openssl-debuginfo, p-cpe:/a:amazon:linux:openssl-devel, p-cpe:/a:amazon:linux:openssl-libs, p-cpe:/a:amazon:linux:openssl-perl, p-cpe:/a:amazon:linux:openssl-static, cpe:/o:amazon:linux:2
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 11/14/2019
Vulnerability Publication Date: 10/30/2018
Reference Information
CVE: CVE-2018-0734, CVE-2019-1559
ALAS: 2019-1362