Vulnerabilities > CVE-2012-6656 - Improper Input Validation vulnerability in multiple products
Attack vector
UNKNOWN Attack complexity
UNKNOWN Privileges required
UNKNOWN Confidentiality impact
UNKNOWN Integrity impact
UNKNOWN Availability impact
UNKNOWN Summary
iconvdata/ibm930.c in GNU C Library (aka glibc) before 2.16 allows context-dependent attackers to cause a denial of service (out-of-bounds read) via a multibyte character value of "0xffff" to the iconv function when converting IBM930 encoded data to UTF-8.
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.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-0170-1.NASL description glibc has been updated to fix security issues : - Fix crashes on invalid input in IBM gconv modules (CVE-2014-6040, CVE-2012-6656, bsc#894553, bsc#894556, GLIBC BZ #17325, GLIBC BZ #14134) - Fixed a stack overflow during hosts parsing (CVE-2013-4357) - Copy filename argument in posix_spawn_file_actions_addopen (CVE-2014-4043, bsc#882600, BZ #17048) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 83675 published 2015-05-20 reporter This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/83675 title SUSE SLES10 Security Update : glibc (SUSE-SU-2015:0170-1) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from SUSE update advisory SUSE-SU-2015:0170-1. # The text itself is copyright (C) SUSE. # include("compat.inc"); if (description) { script_id(83675); script_version("2.9"); script_cvs_date("Date: 2020/01/15"); script_cve_id("CVE-2012-6656", "CVE-2013-4357", "CVE-2014-4043", "CVE-2014-6040"); script_bugtraq_id(67992, 68006, 69470, 69472); script_name(english:"SUSE SLES10 Security Update : glibc (SUSE-SU-2015:0170-1)"); script_summary(english:"Checks rpm output for the updated packages."); script_set_attribute( attribute:"synopsis", value:"The remote SUSE host is missing one or more security updates." ); script_set_attribute( attribute:"description", value: "glibc has been updated to fix security issues : - Fix crashes on invalid input in IBM gconv modules (CVE-2014-6040, CVE-2012-6656, bsc#894553, bsc#894556, GLIBC BZ #17325, GLIBC BZ #14134) - Fixed a stack overflow during hosts parsing (CVE-2013-4357) - Copy filename argument in posix_spawn_file_actions_addopen (CVE-2014-4043, bsc#882600, BZ #17048) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE 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://bugzilla.suse.com/show_bug.cgi?id=844309" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=882600" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=894553" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=894556" ); # https://download.suse.com/patch/finder/?keywords=1ccbe69cba5cc8835258525263c85657 script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?18c9278a" ); script_set_attribute( attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2012-6656/" ); script_set_attribute( attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2013-4357/" ); script_set_attribute( attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2014-6040/" ); # https://www.suse.com/support/update/announcement/2015/suse-su-20150170-1.html script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?dcd4c243" ); script_set_attribute(attribute:"solution", value:"Update the affected glibc packages"); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/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:novell:suse_linux:glibc"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:glibc-devel"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:glibc-html"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:glibc-i18ndata"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:glibc-info"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:glibc-locale"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:glibc-profile"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:nscd"); script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:10"); script_set_attribute(attribute:"vuln_publication_date", value:"2014/10/06"); script_set_attribute(attribute:"patch_publication_date", value:"2015/01/28"); script_set_attribute(attribute:"plugin_publication_date", value:"2015/05/20"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"SuSE Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("rpm.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/SuSE/release"); if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE"); os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release); if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE"); os_ver = os_ver[1]; if (! preg(pattern:"^(SLES10)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLES10", "SUSE " + os_ver); if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu); sp = get_kb_item("Host/SuSE/patchlevel"); if (isnull(sp)) sp = "0"; if (os_ver == "SLES10" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES10 SP4", os_ver + " SP" + sp); flag = 0; if (rpm_check(release:"SLES10", sp:"4", cpu:"x86_64", reference:"glibc-32bit-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", cpu:"x86_64", reference:"glibc-devel-32bit-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", cpu:"x86_64", reference:"glibc-locale-32bit-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", cpu:"x86_64", reference:"glibc-profile-32bit-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", cpu:"s390x", reference:"glibc-32bit-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", cpu:"s390x", reference:"glibc-devel-32bit-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", cpu:"s390x", reference:"glibc-locale-32bit-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", cpu:"s390x", reference:"glibc-profile-32bit-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", reference:"glibc-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", reference:"glibc-devel-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", reference:"glibc-html-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", reference:"glibc-i18ndata-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", reference:"glibc-info-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", reference:"glibc-locale-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", reference:"glibc-profile-2.4-31.115.2")) flag++; if (rpm_check(release:"SLES10", sp:"4", reference:"nscd-2.4-31.115.2")) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get()); else security_hole(0); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "glibc"); }NASL family F5 Networks Local Security Checks NASL id F5_BIGIP_SOL16342.NASL description iconvdata/ibm930.c in GNU C Library (aka glibc) before 2.16 allows context-dependent attackers to cause a denial of service (out-of-bounds read) via a multibyte character value of last seen 2020-06-01 modified 2020-06-02 plugin id 82513 published 2015-04-02 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/82513 title F5 Networks BIG-IP : GNU C Library (glibc) vulnerability (SOL16342) NASL family Mandriva Local Security Checks NASL id MANDRIVA_MDVSA-2014-175.NASL description Multiple vulnerabilities has been found and corrected in glibc : When converting IBM930 code with iconv(), if IBM930 code which includes invalid multibyte character 0xffff is specified, then iconv() segfaults (CVE-2012-6656). Off-by-one error in the __gconv_translit_find function in gconv_trans.c in GNU C Library (aka glibc) allows context-dependent attackers to cause a denial of service (crash) or execute arbitrary code via vectors related to the CHARSET environment variable and gconv transliteration modules (CVE-2014-5119). Crashes were reported in the IBM code page decoding functions (IBM933, IBM935, IBM937, IBM939, IBM1364) (CVE-2014-6040). The updated packages have been patched to correct these issues. last seen 2020-06-01 modified 2020-06-02 plugin id 77654 published 2014-09-12 reporter This script is Copyright (C) 2014-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/77654 title Mandriva Linux Security Advisory : glibc (MDVSA-2014:175) NASL family SuSE Local Security Checks NASL id SUSE_11_GLIBC-150129.NASL description glibc has been updated to fix security issues and bugs : - Fix crashes on invalid input in IBM gconv modules. (CVE-2014-6040 / CVE-2012-6656, bsc#894553, bsc#894556, GLIBC BZ #17325, GLIBC BZ #14134) - Avoid infinite loop in nss_dns getnetbyname. (CVE-2014-9402) - Don last seen 2020-06-01 modified 2020-06-02 plugin id 81295 published 2015-02-11 reporter This script is Copyright (C) 2015-2016 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/81295 title SuSE 11.3 Security Update : glibc (SAT Patch Number 10259) NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-0164-1.NASL description glibc has been updated to fix one security issue and several bugs : Security issue fixed : - Fix crashes on invalid input in IBM gconv modules (CVE-2014-6040, CVE-2012-6656) - Fixed a stack overflow during hosts parsing (CVE-2013-4357) Bugs fixed : - don last seen 2020-06-01 modified 2020-06-02 plugin id 83673 published 2015-05-20 reporter This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/83673 title SUSE SLES11 Security Update : glibc (SUSE-SU-2015:0164-1) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201503-04.NASL description The remote host is affected by the vulnerability described in GLSA-201503-04 (GNU C Library: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in the GNU C Library. Please review the CVE identifiers referenced below for details. Impact : A local attacker may be able to execute arbitrary code or cause a Denial of Service condition,. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 81689 published 2015-03-09 reporter This script is Copyright (C) 2015-2016 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/81689 title GLSA-201503-04 : GNU C Library: Multiple vulnerabilities (GHOST) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-3142.NASL description Several vulnerabilities have been fixed in eglibc, Debian last seen 2020-03-17 modified 2015-01-28 plugin id 81029 published 2015-01-28 reporter This script is Copyright (C) 2015-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/81029 title Debian DSA-3142-1 : eglibc - security update NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-0167-1.NASL description glibc has been updated to fix a security issue and two bugs : Security issue fixed : - Copy filename argument in posix_spawn_file_actions_addopen (CVE-2014-4043) Bugs fixed : - don last seen 2020-06-01 modified 2020-06-02 plugin id 83674 published 2015-05-20 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/83674 title SUSE SLES11 Security Update : glibc (SUSE-SU-2015:0167-1) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-2432-1.NASL description Siddhesh Poyarekar discovered that the GNU C Library incorrectly handled certain multibyte characters when using the iconv function. An attacker could possibly use this issue to cause applications to crash, resulting in a denial of service. This issue only affected Ubuntu 10.04 LTS and Ubuntu 12.04 LTS. (CVE-2012-6656) Adhemerval Zanella Netto discovered that the GNU C Library incorrectly handled certain multibyte characters when using the iconv function. An attacker could possibly use this issue to cause applications to crash, resulting in a denial of service. (CVE-2014-6040) Tim Waugh discovered that the GNU C Library incorrectly enforced the WRDE_NOCMD flag when handling the wordexp function. An attacker could possibly use this issue to execute arbitrary commands. (CVE-2014-7817). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 79718 published 2014-12-04 reporter Ubuntu Security Notice (C) 2014-2019 Canonical, Inc. / NASL script (C) 2014-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/79718 title Ubuntu 10.04 LTS / 12.04 LTS / 14.04 LTS / 14.10 : eglibc, glibc vulnerabilities (USN-2432-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2014-1129-1.NASL description This glibc update fixes a critical privilege escalation problem and two additional issues : - bnc#892073: An off-by-one error leading to a heap-based buffer overflow was found in __gconv_translit_find(). An exploit that targets the problem is publicly available. (CVE-2014-5119) - bnc#836746: Avoid race between {, __de}allocate_stack and __reclaim_stacks during fork. - bnc#844309: Fixed various overflows, reading large /etc/hosts or long names. (CVE-2013-4357) - bnc#894553, bnc#894556: Fixed various crashes on invalid input in IBM gconv modules. (CVE-2014-6040, CVE-2012-6656) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2015-05-20 plugin id 83639 published 2015-05-20 reporter This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/83639 title SUSE SLES11 Security Update : glibc (SUSE-SU-2014:1129-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2014-1128-1.NASL description This glibc update fixes a critical privilege escalation problem and the following security and non-security issues : - bnc#892073: An off-by-one error leading to a heap-based buffer overflow was found in __gconv_translit_find(). An exploit that targets the problem is publicly available. (CVE-2014-5119) - bnc#882600: Copy filename argument in posix_spawn_file_actions_addopen. (CVE-2014-4043) - bnc#860501: Use O_LARGEFILE for utmp file. - bnc#842291: Fix typo in glibc-2.5-dlopen-lookup-race.diff. - bnc#839870: Fix integer overflows in malloc. (CVE-2013-4332) - bnc#834594: Fix readdir_r with long file names. (CVE-2013-4237) - bnc#824639: Drop lock before calling malloc_printerr. - bnc#801246: Fix buffer overrun in regexp matcher. (CVE-2013-0242) - bnc#779320: Fix buffer overflow in strcoll. (CVE-2012-4412) - bnc#894556 / bnc#894553: Fix crashes on invalid input in IBM gconv modules. (CVE-2014-6040, CVE-2012-6656, bnc#894553, bnc#894556, BZ#17325, BZ#14134) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2015-05-20 plugin id 83638 published 2015-05-20 reporter This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/83638 title SUSE SLES10 Security Update : glibc (SUSE-SU-2014:1128-1) NASL family Debian Local Security Checks NASL id DEBIAN_DLA-97.NASL description CVE-2012-6656 Fix validation check when converting from ibm930 to utf. When converting IBM930 code with iconv(), if IBM930 code which includes invalid multibyte character last seen 2020-03-17 modified 2015-03-26 plugin id 82242 published 2015-03-26 reporter This script is Copyright (C) 2015-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/82242 title Debian DLA-97-1 : eglibc security update
References
- http://www.ubuntu.com/usn/USN-2432-1
- http://www.securityfocus.com/bid/69472
- http://www.openwall.com/lists/oss-security/2014/09/02/1
- http://www.mandriva.com/security/advisories?name=MDVSA-2014:175
- https://sourceware.org/bugzilla/show_bug.cgi?id=14134
- http://www.openwall.com/lists/oss-security/2014/08/29/3
- http://www.debian.org/security/2015/dsa-3142
- https://security.gentoo.org/glsa/201503-04
- https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=6e230d11837f3ae7b375ea69d7905f0d18eb79e5