Vulnerabilities > CVE-2012-3291 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Infradead Openconnect
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
COMPLETE Summary
Heap-based buffer overflow in OpenConnect 3.18 allows remote servers to cause a denial of service via a crafted greeting banner.
Vulnerable Configurations
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 family Debian Local Security Checks NASL id DEBIAN_DSA-2495.NASL description A buffer overflow was discovered in OpenConnect, a client for the Cisco AnyConnect VPN, which could result in denial of service. last seen 2020-03-17 modified 2012-06-29 plugin id 59773 published 2012-06-29 reporter This script is Copyright (C) 2012-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/59773 title Debian 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 family Fedora Local Security Checks NASL id FEDORA_2012-6758.NASL description This 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 seen 2020-03-17 modified 2012-05-07 plugin id 59005 published 2012-05-07 reporter This script is Copyright (C) 2012-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/59005 title Fedora 16 : openconnect-3.18-1.fc16 (2012-6758) NASL family SuSE Local Security Checks NASL id OPENSUSE-2013-529.NASL description This 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 seen 2020-06-05 modified 2014-06-13 plugin id 75056 published 2014-06-13 reporter This script is Copyright (C) 2014-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/75056 title openSUSE Security Update : openconnect (openSUSE-SU-2013:1072-1)
Oval
accepted | 2014-06-30T04:06:23.509-04:00 | ||||||||
class | vulnerability | ||||||||
contributors |
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definition_extensions |
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description | Heap-based buffer overflow in OpenConnect 3.18 allows remote servers to cause a denial of service via a crafted greeting banner. | ||||||||
family | unix | ||||||||
id | oval:org.mitre.oval:def:17242 | ||||||||
status | accepted | ||||||||
submitted | 2013-07-03T10:26:26.748+04:00 | ||||||||
title | openconnect vulnerability | ||||||||
version | 7 |
References
- http://git.infradead.org/users/dwmw2/openconnect.git/commitdiff/14cae65318d3ef1f7d449e463b72b6934e82f1c2
- http://lists.fedoraproject.org/pipermail/package-announce/2012-May/079747.html
- http://lists.opensuse.org/opensuse-updates/2013-06/msg00186.html
- http://www.debian.org/security/2012/dsa-2495
- http://www.infradead.org/openconnect/changelog.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17242