Vulnerabilities > CVE-2012-3291 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Infradead Openconnect

047910
CVSS 7.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
COMPLETE
network
low complexity
infradead
CWE-119
nessus

Summary

Heap-based buffer overflow in OpenConnect 3.18 allows remote servers to cause a denial of service via a crafted greeting banner.

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_DSA-2495.NASL
    descriptionA buffer overflow was discovered in OpenConnect, a client for the Cisco AnyConnect VPN, which could result in denial of service.
    last seen2020-03-17
    modified2012-06-29
    plugin id59773
    published2012-06-29
    reporterThis script is Copyright (C) 2012-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/59773
    titleDebian DSA-2495-1 : openconnect - buffer overflow
    code
    #%NASL_MIN_LEVEL 80502
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Debian Security Advisory DSA-2495. The text 
    # itself is copyright (C) Software in the Public Interest, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(59773);
      script_version("1.6");
      script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");
    
      script_cve_id("CVE-2012-3291");
      script_xref(name:"DSA", value:"2495");
    
      script_name(english:"Debian DSA-2495-1 : openconnect - buffer overflow");
      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:
    "A buffer overflow was discovered in OpenConnect, a client for the
    Cisco AnyConnect VPN, which could result in denial of service."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://packages.debian.org/source/squeeze/openconnect"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.debian.org/security/2012/dsa-2495"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "Upgrade the openconnect packages.
    
    For the stable distribution (squeeze), this problem has been fixed in
    version 2.25-0.1+squeeze1."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openconnect");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2012/06/16");
      script_set_attribute(attribute:"plugin_publication_date", value:"2012/06/29");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2012-2020 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:"6.0", prefix:"openconnect", reference:"2.25-0.1+squeeze1")) 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");
    
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2012-6758.NASL
    descriptionThis update fixes a potential buffer overrun when handling the greeting banner from the server. This update fixes a potential crash when processing libproxy results, and introduces some performance improvement Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-03-17
    modified2012-05-07
    plugin id59005
    published2012-05-07
    reporterThis script is Copyright (C) 2012-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/59005
    titleFedora 16 : openconnect-3.18-1.fc16 (2012-6758)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2013-529.NASL
    descriptionThis openconnect update to version 3.20 includes several security and bug fixes. - fix bnc#767616 - fix for CVE-2012-3291 - make vpnc mandatory during build, following upstream changes - package documentation in a -doc package - Update to version 3.20 - Cope with non-keepalive HTTP response on authentication success. - Fix progress callback with incorrect cbdata which caused KDE crash. - Update to version 3.19 - Enable native TPM support when built with GnuTLS. - Enable PKCS#11 token support when built with GnuTLS. - Eliminate all SSL library exposure through libopenconnect. - Parse split DNS information, provide $CISCO_SPLIT_DNS environment variable to vpnc-script. - Attempt to provide new-style MTU information to server (on Linux only, unless specified on command line). - Allow building against GnuTLS, including DTLS support. - Add --with-pkgconfigdir= option to configure for FreeBSD
    last seen2020-06-05
    modified2014-06-13
    plugin id75056
    published2014-06-13
    reporterThis script is Copyright (C) 2014-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/75056
    titleopenSUSE Security Update : openconnect (openSUSE-SU-2013:1072-1)

Oval

accepted2014-06-30T04:06:23.509-04:00
classvulnerability
contributors
  • nameMaria Kedovskaya
    organizationALTX-SOFT
  • nameJerome Athias
    organizationMcAfee, Inc.
definition_extensions
commentopenSUSE 12.2 is installed
ovaloval:org.mitre.oval:def:17262
descriptionHeap-based buffer overflow in OpenConnect 3.18 allows remote servers to cause a denial of service via a crafted greeting banner.
familyunix
idoval:org.mitre.oval:def:17242
statusaccepted
submitted2013-07-03T10:26:26.748+04:00
titleopenconnect vulnerability
version7