Security Bulletin: Vulnerabiliies in libssh2 affect PowerKVM

Summary

PowerKVM is affected by vulnerabilities in libssh2. IBM has now addressed these vulnerabilities.

Vulnerability Details

CVEID: CVE-2019-3863 DESCRIPTION: libssh2 could allow a remote attacker to execute arbitrary code on the system, caused by an integer overflow in user authenticate keyboard interactive. By sending a specially crafted message, a remote attacker could exploit this vulnerability to trigger an out-of-bounds write and execute arbitrary code on the client system.
CVSS Base Score: 7.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/158347&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)

CVEID: CVE-2019-3857 DESCRIPTION: libssh2 could allow a remote attacker to execute arbitrary code on the system, caused by an integer overflow. By sending a specially crafted SSH_MSG_CHANNEL_REQUEST packet with an exit signal message, a remote attacker could exploit this vulnerability to trigger an out-of-bounds write and execute arbitrary code on the client system.
CVSS Base Score: 7.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/158341&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)

CVEID: CVE-2019-3856 DESCRIPTION: libssh2 could allow a remote attacker to execute arbitrary code on the system, caused by an integer overflow in keyboard interactive handling. By sending a specially crafted request, a remote attacker could exploit this vulnerability to trigger an out-of-bounds write and execute arbitrary code on the client system.
CVSS Base Score: 7.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/158340&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)

CVEID: CVE-2019-3855 DESCRIPTION: libssh2 could allow a remote attacker to execute arbitrary code on the system, caused by an integer overflow in transport read. By sending specially crafted packets, a remote attacker could exploit this vulnerability to trigger an out-of-bounds read and execute arbitrary code on the client system.
CVSS Base Score: 7.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/158339&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)

Affected Products and Versions

PowerKVM 3.1

Remediation/Fixes

Customers can update PowerKVM systems by using “yum update”.

Fix images are made available via Fix Central. For version 3.1, see https://ibm.biz/BdHggw. This issue is addressed starting with v3.1.0.2 update 18.

Workarounds and Mitigations

none