Richard Silverman discovered that when doing GSSAPI authentication, libcurl unconditionally performs credential delegation. This hands the server a copy of the client’s security credentials, allowing the server to impersonate the client to any other using the same GSSAPI mechanism. This is obviously a very sensitive operation, which should only be done when the user explicitly so directs.
#%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-2271. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(55491);
script_version("1.10");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id("CVE-2011-2192");
script_xref(name:"DSA", value:"2271");
script_name(english:"Debian DSA-2271-1 : curl - improper delegation of client credentials");
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:
"Richard Silverman discovered that when doing GSSAPI authentication,
libcurl unconditionally performs credential delegation. This hands the
server a copy of the client's security credentials, allowing the
server to impersonate the client to any other using the same GSSAPI
mechanism. This is obviously a very sensitive operation, which should
only be done when the user explicitly so directs."
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/squeeze/curl"
);
script_set_attribute(
attribute:"see_also",
value:"https://www.debian.org/security/2011/dsa-2271"
);
script_set_attribute(
attribute:"solution",
value:
"Upgrade the curl packages.
For the oldstable distribution (lenny), this problem has been fixed in
version 7.18.2-8lenny5.
For the stable distribution (squeeze), this problem has been fixed in
version 7.21.0-2."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:curl");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:5.0");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");
script_set_attribute(attribute:"patch_publication_date", value:"2011/07/02");
script_set_attribute(attribute:"plugin_publication_date", value:"2011/07/05");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2011-2021 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:"5.0", prefix:"curl", reference:"7.18.2-8lenny5")) flag++;
if (deb_check(release:"6.0", prefix:"curl", reference:"7.21.0-2")) flag++;
if (deb_check(release:"6.0", prefix:"libcurl3", reference:"7.21.0-2")) flag++;
if (deb_check(release:"6.0", prefix:"libcurl3-dbg", reference:"7.21.0-2")) flag++;
if (deb_check(release:"6.0", prefix:"libcurl3-gnutls", reference:"7.21.0-2")) flag++;
if (deb_check(release:"6.0", prefix:"libcurl4-gnutls-dev", reference:"7.21.0-2")) flag++;
if (deb_check(release:"6.0", prefix:"libcurl4-openssl-dev", reference:"7.21.0-2")) 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 | curl | p-cpe:/a:debian:debian_linux:curl |
debian | debian_linux | 5.0 | cpe:/o:debian:debian_linux:5.0 |
debian | debian_linux | 6.0 | cpe:/o:debian:debian_linux:6.0 |