Debian LTS Advisory ([SECURITY] [DLA 1730-1] libssh2 security update)

Published: 2019-03-25 22:00:00
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:M/Au:N/C:C/I:C/A:C

Summary:
The remote host is missing an update for the 'libssh2' Linux Distribution Package(s) announced via the DSA-1730-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Several vulnerabilities have recently been discovered in libssh2, a client-side C library implementing the SSH2 protocol CVE-2019-3855 An integer overflow flaw which could have lead to an out of bounds write was discovered in libssh2 in the way packets were read from the server. A remote attacker who compromised an SSH server could have been able to execute code on the client system when a user connected to the server. CVE-2019-3856 An integer overflow flaw, which could have lead to an out of bounds write, was discovered in libssh2 in the way keyboard prompt requests were parsed. A remote attacker who compromised an SSH server could have been able to execute code on the client system when a user connected to the server. CVE-2019-3857 An integer overflow flaw which could have lead to an out of bounds write was discovered in libssh2 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal were parsed. A remote attacker who compromises an SSH server could have been able to execute code on the client system when a user connected to the server. CVE-2019-3858 An out of bounds read flaw was discovered in libssh2 when a specially crafted SFTP packet was received from the server. A remote attacker who compromised an SSH server could have been able to cause a Denial of Service or read data in the client memory. CVE-2019-3859 An out of bounds read flaw was discovered in libssh2's _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromised an SSH server could have be able to cause a Denial of Service or read data in the client memory. CVE-2019-3860 An out of bounds read flaw was discovered in libssh2 in the way SFTP packets with empty payloads were parsed. A remote attacker who compromised an SSH server could have be able to cause a Denial of Service or read data in the client memory. CVE-2019-3861 An out of bounds read flaw was discovered in libssh2 in the way SSH packets with a padding length value greater than the packet length were parsed. A remote attacker who compromised a SSH server could have been able to cause a Denial of Service or read data in the client memory. CVE-2019-3862 An out of bounds read flaw was discovered in libssh2 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload were parsed. A remote attacker who compromised an SSH server could have been able to cause a Denial of Service or read data in the client memory. CVE-2019-3863 A server could have sent multiple keyboard interactive response messages whose total length were greater than unsigned char max characters. This value was used as an index to copy memory causing an out of bounds memory write error.

Affected Versions:
'libssh2' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 8 'Jessie', these problems have been fixed in version 1.4.3-4.1+deb8u2. We recommend that you upgrade your libssh2 Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2019-3855
https://nvd.nist.gov/vuln/detail/CVE-2019-3856
https://nvd.nist.gov/vuln/detail/CVE-2019-3857
https://nvd.nist.gov/vuln/detail/CVE-2019-3858
https://nvd.nist.gov/vuln/detail/CVE-2019-3859
https://nvd.nist.gov/vuln/detail/CVE-2019-3860
https://nvd.nist.gov/vuln/detail/CVE-2019-3861
https://nvd.nist.gov/vuln/detail/CVE-2019-3862
https://nvd.nist.gov/vuln/detail/CVE-2019-3863

References:

https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
https://security-tracker.debian.org/tracker/DLA-1730-1

Severity
High
CVSS Score
9.3
Published
2019-03-25
Modified
2019-03-29
Category
Debian Local Security Checks

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