CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS
Percentile
78.7%
A flaw was found in the way the kex_agree_methods() function of libssh2 performed a key exchange when negotiating a new SSH session. A man-in-the- middle attacker could use a crafted SSH_MSG_KEXINIT packet to crash a connecting libssh2 client. (CVE-2015-1782)
This update also fixes the following bugs :
Previously, libssh2 did not correctly adjust the size of the receive window while reading from an SSH channel.
This caused downloads over the secure copy (SCP) protocol to consume an excessive amount of memory. A series of upstream patches has been applied on the libssh2 source code to improve handling of the receive window size. Now, SCP downloads work as expected.
Prior to this update, libssh2 did not properly initialize an internal variable holding the SSH agent file descriptor, which caused the agent destructor to close the standard input file descriptor by mistake. An upstream patch has been applied on libssh2 sources to properly initialize the internal variable. Now, libssh2 closes only the file descriptors it owns.
After installing these updated packages, all running applications using libssh2 must be restarted for this update to take effect.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(87561);
script_version("2.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");
script_cve_id("CVE-2015-1782");
script_name(english:"Scientific Linux Security Update : libssh2 on SL7.x x86_64 (20151119)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:
"The remote Scientific Linux host is missing one or more security
updates."
);
script_set_attribute(
attribute:"description",
value:
"A flaw was found in the way the kex_agree_methods() function of
libssh2 performed a key exchange when negotiating a new SSH session. A
man-in-the- middle attacker could use a crafted SSH_MSG_KEXINIT packet
to crash a connecting libssh2 client. (CVE-2015-1782)
This update also fixes the following bugs :
- Previously, libssh2 did not correctly adjust the size of
the receive window while reading from an SSH channel.
This caused downloads over the secure copy (SCP)
protocol to consume an excessive amount of memory. A
series of upstream patches has been applied on the
libssh2 source code to improve handling of the receive
window size. Now, SCP downloads work as expected.
- Prior to this update, libssh2 did not properly
initialize an internal variable holding the SSH agent
file descriptor, which caused the agent destructor to
close the standard input file descriptor by mistake. An
upstream patch has been applied on libssh2 sources to
properly initialize the internal variable. Now, libssh2
closes only the file descriptors it owns.
After installing these updated packages, all running applications
using libssh2 must be restarted for this update to take effect."
);
# https://listserv.fnal.gov/scripts/wa.exe?A2=ind1512&L=scientific-linux-errata&F=&S=&P=15335
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?243f8b04"
);
script_set_attribute(attribute:"solution", value:"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libssh2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libssh2-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libssh2-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libssh2-docs");
script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");
script_set_attribute(attribute:"vuln_publication_date", value:"2015/03/13");
script_set_attribute(attribute:"patch_publication_date", value:"2015/11/19");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/22");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2015-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Scientific Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/RedHat/release", "Host/RedHat/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 7.x", "Scientific Linux " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);
flag = 0;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libssh2-1.4.3-10.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libssh2-debuginfo-1.4.3-10.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libssh2-devel-1.4.3-10.el7")) flag++;
if (rpm_check(release:"SL7", reference:"libssh2-docs-1.4.3-10.el7")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libssh2 / libssh2-debuginfo / libssh2-devel / libssh2-docs");
}
Vendor | Product | Version | CPE |
---|---|---|---|
fermilab | scientific_linux | libssh2-debuginfo | p-cpe:/a:fermilab:scientific_linux:libssh2-debuginfo |
fermilab | scientific_linux | libssh2-docs | p-cpe:/a:fermilab:scientific_linux:libssh2-docs |
fermilab | scientific_linux | x-cpe:/o:fermilab:scientific_linux | |
fermilab | scientific_linux | libssh2-devel | p-cpe:/a:fermilab:scientific_linux:libssh2-devel |
fermilab | scientific_linux | libssh2 | p-cpe:/a:fermilab:scientific_linux:libssh2 |