Vulnerabilities > CVE-2015-8853 - Improper Input Validation vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
PARTIAL Summary
The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to cause a denial of service (infinite loop) via crafted utf-8 data, as demonstrated by "a\x80."
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 Ubuntu Local Security Checks NASL id UBUNTU_USN-3625-1.NASL description It was discovered that Perl incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause Perl to hang, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2015-8853) It was discovered that Perl incorrectly loaded libraries from the current working directory. A local attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-6185) It was discovered that Perl incorrectly handled the rmtree and remove_tree functions. A local attacker could possibly use this issue to set the mode on arbitrary files. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-6512) Brian Carpenter discovered that Perl incorrectly handled certain regular expressions. An attacker could use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue has only been addressed in Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2018-6797) Nguyen Duc Manh discovered that Perl incorrectly handled certain regular expressions. An attacker could use this issue to cause Perl to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2018-6798) GwanYeong Kim discovered that Perl incorrectly handled certain data when using the pack function. An attacker could use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-6913). 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 109086 published 2018-04-17 reporter Ubuntu Security Notice (C) 2018-2019 Canonical, Inc. / NASL script (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/109086 title Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : perl vulnerabilities (USN-3625-1) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Ubuntu Security Notice USN-3625-1. The text # itself is copyright (C) Canonical, Inc. See # <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered # trademark of Canonical, Inc. # include("compat.inc"); if (description) { script_id(109086); script_version("1.5"); script_cvs_date("Date: 2019/09/18 12:31:48"); script_cve_id("CVE-2015-8853", "CVE-2016-6185", "CVE-2017-6512", "CVE-2018-6797", "CVE-2018-6798", "CVE-2018-6913"); script_xref(name:"USN", value:"3625-1"); script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : perl vulnerabilities (USN-3625-1)"); script_summary(english:"Checks dpkg output for updated package."); script_set_attribute( attribute:"synopsis", value:"The remote Ubuntu host is missing a security-related patch." ); script_set_attribute( attribute:"description", value: "It was discovered that Perl incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause Perl to hang, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2015-8853) It was discovered that Perl incorrectly loaded libraries from the current working directory. A local attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-6185) It was discovered that Perl incorrectly handled the rmtree and remove_tree functions. A local attacker could possibly use this issue to set the mode on arbitrary files. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-6512) Brian Carpenter discovered that Perl incorrectly handled certain regular expressions. An attacker could use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue has only been addressed in Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2018-6797) Nguyen Duc Manh discovered that Perl incorrectly handled certain regular expressions. An attacker could use this issue to cause Perl to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2018-6798) GwanYeong Kim discovered that Perl incorrectly handled certain data when using the pack function. An attacker could use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-6913). 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." ); script_set_attribute( attribute:"see_also", value:"https://usn.ubuntu.com/3625-1/" ); script_set_attribute(attribute:"solution", value:"Update the affected perl package."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl"); script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04"); script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04"); script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:17.10"); script_set_attribute(attribute:"vuln_publication_date", value:"2016/05/25"); script_set_attribute(attribute:"patch_publication_date", value:"2018/04/16"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/04/17"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"Ubuntu Security Notice (C) 2018-2019 Canonical, Inc. / NASL script (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Ubuntu Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l"); exit(0); } include("audit.inc"); include("ubuntu.inc"); include("misc_func.inc"); if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/Ubuntu/release"); if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu"); release = chomp(release); if (! preg(pattern:"^(14\.04|16\.04|17\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 14.04 / 16.04 / 17.10", "Ubuntu " + release); if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu); flag = 0; if (ubuntu_check(osver:"14.04", pkgname:"perl", pkgver:"5.18.2-2ubuntu1.4")) flag++; if (ubuntu_check(osver:"16.04", pkgname:"perl", pkgver:"5.22.1-9ubuntu0.3")) flag++; if (ubuntu_check(osver:"17.10", pkgname:"perl", pkgver:"5.26.0-8ubuntu1.1")) flag++; if (flag) { security_report_v4( port : 0, severity : SECURITY_HOLE, extra : ubuntu_report_get() ); exit(0); } else { tested = ubuntu_pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "perl"); }
NASL family SuSE Local Security Checks NASL id OPENSUSE-2016-1086.NASL description This update for Perl fixes the following issues : - CVE-2016-6185: Xsloader looking at a last seen 2020-06-05 modified 2016-09-19 plugin id 93583 published 2016-09-19 reporter This script is Copyright (C) 2016-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/93583 title openSUSE Security Update : perl (openSUSE-2016-1086) code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from openSUSE Security Update openSUSE-2016-1086. # # The text description of this plugin is (C) SUSE LLC. # include("compat.inc"); if (description) { script_id(93583); script_version("2.3"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04"); script_cve_id("CVE-2015-8853", "CVE-2016-1238", "CVE-2016-2381", "CVE-2016-6185"); script_name(english:"openSUSE Security Update : perl (openSUSE-2016-1086)"); script_summary(english:"Check for the openSUSE-2016-1086 patch"); script_set_attribute( attribute:"synopsis", value:"The remote openSUSE host is missing a security update." ); script_set_attribute( attribute:"description", value: "This update for Perl fixes the following issues : - CVE-2016-6185: Xsloader looking at a '(eval)' directory. (bsc#988311) - CVE-2016-1238: Searching current directory for optional modules. (bsc#987887) - CVE-2015-8853: Regular expression engine hanging on bad utf8. (bsc) - CVE-2016-2381: Environment dup handling bug. (bsc#967082) - 'Insecure dependency in require' error in taint mode. (bsc#984906) - Memory leak in 'use utf8' handling. (bsc#928292) - Missing lock prototype to the debugger. (bsc#932894) This update was imported from the SUSE:SLE-12:Update update project." ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=928292" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=932894" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=967082" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=984906" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=987887" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=988311" ); script_set_attribute(attribute:"solution", value:"Update the affected perl packages."); script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl-32bit"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl-base"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl-base-32bit"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl-base-debuginfo"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl-base-debuginfo-32bit"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl-debuginfo"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl-debuginfo-32bit"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:perl-debugsource"); script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:42.1"); script_set_attribute(attribute:"patch_publication_date", value:"2016/09/15"); script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/19"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2016-2020 Tenable Network Security, Inc."); script_family(english:"SuSE Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu"); 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, "openSUSE"); if (release !~ "^(SUSE42\.1)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "42.1", release); if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); ourarch = get_kb_item("Host/cpu"); if (!ourarch) audit(AUDIT_UNKNOWN_ARCH); if (ourarch !~ "^(i586|i686|x86_64)$") audit(AUDIT_ARCH_NOT, "i586 / i686 / x86_64", ourarch); flag = 0; if ( rpm_check(release:"SUSE42.1", reference:"perl-5.18.2-5.1") ) flag++; if ( rpm_check(release:"SUSE42.1", reference:"perl-base-5.18.2-5.1") ) flag++; if ( rpm_check(release:"SUSE42.1", reference:"perl-base-debuginfo-5.18.2-5.1") ) flag++; if ( rpm_check(release:"SUSE42.1", reference:"perl-debuginfo-5.18.2-5.1") ) flag++; if ( rpm_check(release:"SUSE42.1", reference:"perl-debugsource-5.18.2-5.1") ) flag++; if ( rpm_check(release:"SUSE42.1", cpu:"x86_64", reference:"perl-32bit-5.18.2-5.1") ) flag++; if ( rpm_check(release:"SUSE42.1", cpu:"x86_64", reference:"perl-base-32bit-5.18.2-5.1") ) flag++; if ( rpm_check(release:"SUSE42.1", cpu:"x86_64", reference:"perl-base-debuginfo-32bit-5.18.2-5.1") ) flag++; if ( rpm_check(release:"SUSE42.1", cpu:"x86_64", reference:"perl-debuginfo-32bit-5.18.2-5.1") ) 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, "perl-32bit / perl / perl-base-32bit / perl-base / etc"); }
NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201701-75.NASL description The remote host is affected by the vulnerability described in GLSA-201701-75 (Perl: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Perl. Please review the CVE identifiers referenced below for details. Impact : A remote attacker could possibly execute arbitrary code with the privileges of the process, cause a Denial of Service condition, or escalate privileges. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 96861 published 2017-01-30 reporter This script is Copyright (C) 2017 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/96861 title GLSA-201701-75 : Perl: Multiple vulnerabilities NASL family SuSE Local Security Checks NASL id SUSE_SU-2016-2246-1.NASL description This update for perl fixes the following issues : - CVE-2016-6185: xsloader looking at a last seen 2020-06-01 modified 2020-06-02 plugin id 93371 published 2016-09-08 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/93371 title SUSE SLES11 Security Update : perl (SUSE-SU-2016:2246-1) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-2035.NASL description According to the versions of the perl packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to cause a denial of service (infinite loop) via crafted utf-8 data, as demonstrated by last seen 2020-05-08 modified 2019-09-24 plugin id 129228 published 2019-09-24 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/129228 title EulerOS 2.0 SP3 : perl (EulerOS-SA-2019-2035) NASL family Fedora Local Security Checks NASL id FEDORA_2016-5A9313E4B4.NASL description This release fixes CVE-2015-8853 (regexp matching hangs indefinitely on illegal UTF-8 input). 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 2020-06-05 modified 2016-05-09 plugin id 90956 published 2016-05-09 reporter This script is Copyright (C) 2016-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/90956 title Fedora 22 : perl-5.20.3-330.fc22 (2016-5a9313e4b4) NASL family SuSE Local Security Checks NASL id SUSE_SU-2016-2263-1.NASL description This update for Perl fixes the following issues : - CVE-2016-6185: Xsloader looking at a last seen 2020-06-01 modified 2020-06-02 plugin id 93437 published 2016-09-12 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/93437 title SUSE SLED12 / SLES12 Security Update : perl (SUSE-SU-2016:2263-1) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-1864.NASL description According to the version of the perl packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to cause a denial of service (infinite loop) via crafted utf-8 data, as demonstrated by last seen 2020-05-08 modified 2019-09-17 plugin id 128916 published 2019-09-17 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/128916 title EulerOS 2.0 SP2 : perl (EulerOS-SA-2019-1864) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-1800.NASL description According to the version of the perl packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to cause a denial of service (infinite loop) via crafted utf-8 data, as demonstrated by last seen 2020-05-06 modified 2019-08-23 plugin id 128092 published 2019-08-23 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/128092 title EulerOS 2.0 SP5 : perl (EulerOS-SA-2019-1800)
References
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183592.html
- http://perl5.git.perl.org/perl.git/commitdiff/22b433eff9a1ffa2454e18405a56650f07b385b5
- http://www.openwall.com/lists/oss-security/2016/04/20/5
- http://www.openwall.com/lists/oss-security/2016/04/20/7
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- http://www.securityfocus.com/bid/86707
- https://bugzilla.redhat.com/show_bug.cgi?id=1329106
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
- https://rt.perl.org/Public/Bug/Display.html?id=123562
- https://security.gentoo.org/glsa/201701-75
- https://usn.ubuntu.com/3625-1/
- https://usn.ubuntu.com/3625-2/