Vulnerabilities > CVE-2018-5766 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Libav

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
libav
CWE-119
nessus
NVD
Published: 2018-01-18
Updated: 2019-09-02

Summary

In Libav through 12.2, there is an invalid memcpy in the av_packet_ref function of libavcodec/avpacket.c. Remote attackers could leverage this vulnerability to cause a denial of service (segmentation fault) via a crafted avi file.

Vulnerable Configurations

Part Description Count
Application
Libav
124

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

NASL familyDebian Local Security Checks
NASL idDEBIAN_DLA-1907.NASL
descriptionSeveral security issues have been corrected in multiple demuxers and decoders of the libav multimedia library. CVE-2017-9987 In Libav, there was a heap-based buffer overflow in the function hpel_motion in mpegvideo_motion.c. A crafted input could have lead to a remote denial of service attack. CVE-2018-5766 In Libav there was an invalid memcpy in the av_packet_ref function of libavcodec/avpacket.c. Remote attackers could have leveraged this vulnerability to cause a denial of service (segmentation fault) via a crafted avi file. CVE-2018-11102 A read access violation in the mov_probe function in libavformat/mov.c allowed remote attackers to cause a denial of service (application crash), as demonstrated by avconv. CVE-2019-14372 In Libav, there was an infinite loop in the function wv_read_block_header() in the file wvdec.c. CVE-2019-14442 In mpc8_read_header in libavformat/mpc8.c, an input file could have resulted in an avio_seek infinite loop and hang, with 100% CPU consumption. Attackers could have leveraged this vulnerability to cause a denial of service via a crafted file. For Debian 8
last seen2020-06-01
modified2020-06-02
plugin id128427
published2019-09-03
reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/128427
titleDebian DLA-1907-1 : libav security update
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1907-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(128427);
  script_version("1.3");
  script_cvs_date("Date: 2019/12/31");

  script_cve_id("CVE-2017-9987", "CVE-2018-11102", "CVE-2018-5766", "CVE-2019-14372", "CVE-2019-14442");

  script_name(english:"Debian DLA-1907-1 : libav security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Several security issues have been corrected in multiple demuxers and
decoders of the libav multimedia library.

CVE-2017-9987

In Libav, there was a heap-based buffer overflow in the function
hpel_motion in mpegvideo_motion.c. A crafted input could have lead to
a remote denial of service attack.

CVE-2018-5766

In Libav there was an invalid memcpy in the av_packet_ref function of
libavcodec/avpacket.c. Remote attackers could have leveraged this
vulnerability to cause a denial of service (segmentation fault) via a
crafted avi file.

CVE-2018-11102

A read access violation in the mov_probe function in libavformat/mov.c
allowed remote attackers to cause a denial of service (application
crash), as demonstrated by avconv.

CVE-2019-14372

In Libav, there was an infinite loop in the function
wv_read_block_header() in the file wvdec.c.

CVE-2019-14442

In mpc8_read_header in libavformat/mpc8.c, an input file could have
resulted in an avio_seek infinite loop and hang, with 100% CPU
consumption. Attackers could have leveraged this vulnerability to
cause a denial of service via a crafted file.

For Debian 8 'Jessie', these problems have been fixed in version
6:11.12-1~deb8u8.

We recommend that you upgrade your libav packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2019/09/msg00000.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/libav"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-5766");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libav-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libav-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libav-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavcodec-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavcodec-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavcodec-extra-56");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavcodec56");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavdevice-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavdevice55");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavfilter-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavfilter5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavformat-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavformat56");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavresample-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavresample2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavutil-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libavutil54");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libswscale-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libswscale3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/09/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/09/03");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019 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:"8.0", prefix:"libav-dbg", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libav-doc", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libav-tools", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavcodec-dev", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavcodec-extra", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavcodec-extra-56", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavcodec56", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavdevice-dev", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavdevice55", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavfilter-dev", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavfilter5", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavformat-dev", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavformat56", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavresample-dev", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavresample2", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavutil-dev", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libavutil54", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libswscale-dev", reference:"6:11.12-1~deb8u8")) flag++;
if (deb_check(release:"8.0", prefix:"libswscale3", reference:"6:11.12-1~deb8u8")) 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");

References