CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:N/I:N/A:C
EPSS
Percentile
98.5%
Several vulnerabilities were discovered in krb5, the MIT implementation of Kerberos. The Common Vulnerabilities and Exposures project identifies the following problems :
CVE-2015-2695 It was discovered that applications which call gss_inquire_context() on a partially-established SPNEGO context can cause the GSS-API library to read from a pointer using the wrong type, leading to a process crash.
CVE-2015-2696 It was discovered that applications which call gss_inquire_context() on a partially-established IAKERB context can cause the GSS-API library to read from a pointer using the wrong type, leading to a process crash.
CVE-2015-2697 It was discovered that the build_principal_va() function incorrectly handles input strings. An authenticated attacker can take advantage of this flaw to cause a KDC to crash using a TGS request with a large realm field beginning with a null byte.
#%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-3395. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(86795);
script_version("2.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");
script_cve_id("CVE-2015-2695", "CVE-2015-2696", "CVE-2015-2697");
script_xref(name:"DSA", value:"3395");
script_name(english:"Debian DSA-3395-1 : krb5 - 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:
"Several vulnerabilities were discovered in krb5, the MIT
implementation of Kerberos. The Common Vulnerabilities and Exposures
project identifies the following problems :
- CVE-2015-2695
It was discovered that applications which call
gss_inquire_context() on a partially-established SPNEGO
context can cause the GSS-API library to read from a
pointer using the wrong type, leading to a process
crash.
- CVE-2015-2696
It was discovered that applications which call
gss_inquire_context() on a partially-established IAKERB
context can cause the GSS-API library to read from a
pointer using the wrong type, leading to a process
crash.
- CVE-2015-2697
It was discovered that the build_principal_va() function
incorrectly handles input strings. An authenticated
attacker can take advantage of this flaw to cause a KDC
to crash using a TGS request with a large realm field
beginning with a null byte."
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=803083"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=803084"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=803088"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2015-2695"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2015-2696"
);
script_set_attribute(
attribute:"see_also",
value:"https://security-tracker.debian.org/tracker/CVE-2015-2697"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/wheezy/krb5"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/jessie/krb5"
);
script_set_attribute(
attribute:"see_also",
value:"https://www.debian.org/security/2015/dsa-3395"
);
script_set_attribute(
attribute:"solution",
value:
"Upgrade the krb5 packages.
For the oldstable distribution (wheezy), these problems have been
fixed in version 1.10.1+dfsg-5+deb7u4.
For the stable distribution (jessie), these problems have been fixed
in version 1.12.1+dfsg-19+deb8u1."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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:krb5");
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:"2015/11/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/11/09");
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:"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:"krb5-admin-server", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"krb5-doc", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"krb5-gss-samples", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"krb5-kdc", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"krb5-kdc-ldap", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"krb5-locales", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"krb5-multidev", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"krb5-pkinit", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"krb5-user", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libgssapi-krb5-2", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libgssrpc4", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libk5crypto3", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libkadm5clnt-mit8", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libkadm5srv-mit8", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libkdb5-6", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libkrb5-3", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libkrb5-dbg", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libkrb5-dev", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"7.0", prefix:"libkrb5support0", reference:"1.10.1+dfsg-5+deb7u4")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-admin-server", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-doc", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-gss-samples", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-kdc", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-kdc-ldap", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-locales", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-multidev", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-otp", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-pkinit", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"krb5-user", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libgssapi-krb5-2", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libgssrpc4", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libk5crypto3", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkadm5clnt-mit9", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkadm5srv-mit9", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkdb5-7", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkrad-dev", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkrad0", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkrb5-3", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkrb5-dbg", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkrb5-dev", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libkrb5support0", reference:"1.12.1+dfsg-19+deb8u1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
else security_hole(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
Vendor | Product | Version | CPE |
---|---|---|---|
debian | debian_linux | krb5 | p-cpe:/a:debian:debian_linux:krb5 |
debian | debian_linux | 7.0 | cpe:/o:debian:debian_linux:7.0 |
debian | debian_linux | 8.0 | cpe:/o:debian:debian_linux:8.0 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2695
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2696
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2697
bugs.debian.org/cgi-bin/bugreport.cgi?bug=803083
bugs.debian.org/cgi-bin/bugreport.cgi?bug=803084
bugs.debian.org/cgi-bin/bugreport.cgi?bug=803088
packages.debian.org/source/jessie/krb5
packages.debian.org/source/wheezy/krb5
security-tracker.debian.org/tracker/CVE-2015-2695
security-tracker.debian.org/tracker/CVE-2015-2696
security-tracker.debian.org/tracker/CVE-2015-2697
www.debian.org/security/2015/dsa-3395