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Debian dsa-5724 : openssh-client - security update

high Nessus Plugin ID 201213

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Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 12 host has packages installed that are affected by a vulnerability as referenced in the dsa-5724 advisory.

 - ------------------------------------------------------------------------- Debian Security Advisory DSA-5724-1 [email protected] https://www.debian.org/security/ Salvatore Bonaccorso July 01, 2024 https://www.debian.org/security/faq
 - -------------------------------------------------------------------------

 Package : openssh CVE ID : CVE-2024-6387

 The Qualys Threat Research Unit (TRU) discovered that OpenSSH, an implementation of the SSH protocol suite, is prone to a signal handler race condition. If a client does not authenticate within LoginGraceTime seconds (120 by default), then sshd's SIGALRM handler is called asynchronously and calls various functions that are not async-signal-safe. A remote unauthenticated attacker can take advantage of this flaw to execute arbitrary code with root privileges. This flaw affects sshd in its default configuration.

 Details can be found in the Qualys advisory at https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt

 For the stable distribution (bookworm), this problem has been fixed in version 1:9.2p1-2+deb12u3.

 We recommend that you upgrade your openssh packages.

 For the detailed security status of openssh please refer to its security tracker page at:
 https://security-tracker.debian.org/tracker/openssh

 Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

 Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the openssh-client packages.

See Also

https://security-tracker.debian.org/tracker/source-package/openssh

https://security-tracker.debian.org/tracker/CVE-2024-6387

https://packages.debian.org/source/bookworm/openssh

Plugin Details

Severity: High

ID: 201213

File Name: debian_DSA-5724.nasl

Version: 1.1

Type: local

Agent: unix

Published: 7/1/2024

Updated: 7/1/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.4

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2024-6387

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:ssh-askpass-gnome, p-cpe:/a:debian:debian_linux:openssh-server-udeb, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:ssh, p-cpe:/a:debian:debian_linux:openssh-sftp-server, p-cpe:/a:debian:debian_linux:openssh-server, p-cpe:/a:debian:debian_linux:openssh-tests, p-cpe:/a:debian:debian_linux:openssh-client, p-cpe:/a:debian:debian_linux:openssh-client-udeb

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/1/2024

Vulnerability Publication Date: 7/1/2024

Reference Information

CVE: CVE-2024-6387