Alex Rousskov from The Measurement Factory discovered that Squid3, a fully featured web proxy cache, does not properly handle errors for certain malformed HTTP responses. A remote HTTP server can exploit this flaw to cause a denial of service (assertion failure and daemon exit).
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DSA-3522. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(90033);
script_version("2.9");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");
script_cve_id("CVE-2016-2571");
script_xref(name:"DSA", value:"3522");
script_name(english:"Debian DSA-3522-1 : squid3 - security update");
script_summary(english:"Checks dpkg output for the updated package");
script_set_attribute(
attribute:"synopsis",
value:"The remote Debian host is missing a security-related update."
);
script_set_attribute(
attribute:"description",
value:
"Alex Rousskov from The Measurement Factory discovered that Squid3, a
fully featured web proxy cache, does not properly handle errors for
certain malformed HTTP responses. A remote HTTP server can exploit
this flaw to cause a denial of service (assertion failure and daemon
exit)."
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/wheezy/squid3"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/jessie/squid3"
);
script_set_attribute(
attribute:"see_also",
value:"https://www.debian.org/security/2016/dsa-3522"
);
script_set_attribute(
attribute:"solution",
value:
"Upgrade the squid3 packages.
For the oldstable distribution (wheezy), this problem has been fixed
in version 3.1.20-2.2+deb7u4.
For the stable distribution (jessie), this problem has been fixed in
version 3.4.8-6+deb8u2."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid3");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");
script_set_attribute(attribute:"patch_publication_date", value:"2016/03/20");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/03/21");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2016-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Debian Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
exit(0);
}
include("audit.inc");
include("debian_package.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (deb_check(release:"7.0", prefix:"squid-cgi", reference:"3.1.20-2.2+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"squid3", reference:"3.1.20-2.2+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"squid3-common", reference:"3.1.20-2.2+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"squid3-dbg", reference:"3.1.20-2.2+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"squidclient", reference:"3.1.20-2.2+deb7u4")) flag++;
if (deb_check(release:"8.0", prefix:"squid-cgi", reference:"3.4.8-6+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"squid-purge", reference:"3.4.8-6+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"squid3", reference:"3.4.8-6+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"squid3-common", reference:"3.4.8-6+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"squid3-dbg", reference:"3.4.8-6+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"squidclient", reference:"3.4.8-6+deb8u2")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
else security_warning(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
Vendor | Product | Version | CPE |
---|---|---|---|
debian | debian_linux | squid3 | p-cpe:/a:debian:debian_linux:squid3 |
debian | debian_linux | 7.0 | cpe:/o:debian:debian_linux:7.0 |
debian | debian_linux | 8.0 | cpe:/o:debian:debian_linux:8.0 |