Vulnerabilities > CVE-2013-2850 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Linux Kernel
Attack vector
UNKNOWN Attack complexity
UNKNOWN Privileges required
UNKNOWN Confidentiality impact
UNKNOWN Integrity impact
UNKNOWN Availability impact
UNKNOWN Summary
Heap-based buffer overflow in the iscsi_add_notunderstood_response function in drivers/target/iscsi/iscsi_target_parameters.c in the iSCSI target subsystem in the Linux kernel through 3.9.4 allows remote attackers to cause a denial of service (memory corruption and OOPS) or possibly execute arbitrary code via a long key that is not properly handled during construction of an error-response packet.
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 Fedora Local Security Checks NASL id FEDORA_2013-10050.NASL description Bugfix update to 3.9.4. Fixes UEFI NVRAM space issues that prevented booting on some machines. 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 2013-07-12 plugin id 67264 published 2013-07-12 reporter This script is Copyright (C) 2013-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/67264 title Fedora 19 : kernel-3.9.4-301.fc19 (2013-10050) code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Fedora Security Advisory 2013-10050. # include("compat.inc"); if (description) { script_id(67264); script_version("1.4"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12"); script_cve_id("CVE-2013-2850"); script_bugtraq_id(60243); script_xref(name:"FEDORA", value:"2013-10050"); script_name(english:"Fedora 19 : kernel-3.9.4-301.fc19 (2013-10050)"); script_summary(english:"Checks rpm output for the updated package."); script_set_attribute( attribute:"synopsis", value:"The remote Fedora host is missing a security update." ); script_set_attribute( attribute:"description", value: "Bugfix update to 3.9.4. Fixes UEFI NVRAM space issues that prevented booting on some machines. 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." ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=968036" ); # https://lists.fedoraproject.org/pipermail/package-announce/2013-June/107991.html script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?85c34661" ); script_set_attribute( attribute:"solution", value:"Update the affected kernel package." ); script_set_cvss_base_vector("CVSS2#AV:A/AC:M/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/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:fedoraproject:fedora:kernel"); script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:19"); script_set_attribute(attribute:"patch_publication_date", value:"2013/06/05"); script_set_attribute(attribute:"plugin_publication_date", value:"2013/07/12"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2013-2020 Tenable Network Security, Inc."); script_family(english:"Fedora Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release"); if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora"); os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release); if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora"); os_ver = os_ver[1]; if (! ereg(pattern:"^19([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 19.x", "Fedora " + os_ver); if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu); flag = 0; if (rpm_check(release:"FC19", reference:"kernel-3.9.4-301.fc19")) 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, "kernel"); }
NASL family Fedora Local Security Checks NASL id FEDORA_2013-10695.NASL description Update to the latest upstream stable release, Linux v3.9.5 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 2013-07-12 plugin id 67285 published 2013-07-12 reporter This script is Copyright (C) 2013-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/67285 title Fedora 18 : kernel-3.9.5-201.fc18 (2013-10695) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-1847-1.NASL description Kees Cook discovered a flaw in the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 66715 published 2013-05-31 reporter Ubuntu Security Notice (C) 2013-2019 Canonical, Inc. / NASL script (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/66715 title Ubuntu 13.04 : linux vulnerability (USN-1847-1) NASL family Mandriva Local Security Checks NASL id MANDRIVA_MDVSA-2013-194.NASL description Multiple vulnerabilities has been found and corrected in the Linux kernel : net/ceph/auth_none.c in the Linux kernel through 3.10 allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via an auth_reply message that triggers an attempted build_request operation. (CVE-2013-1059) The HP Smart Array controller disk-array driver and Compaq SMART2 controller disk-array driver in the Linux kernel through 3.9.4 do not initialize certain data structures, which allows local users to obtain sensitive information from kernel memory via (1) a crafted IDAGETPCIINFO command for a /dev/ida device, related to the ida_locked_ioctl function in drivers/block/cpqarray.c or (2) a crafted CCISS_PASSTHRU32 command for a /dev/cciss device, related to the cciss_ioctl32_passthru function in drivers/block/cciss.c. (CVE-2013-2147) The fill_event_metadata function in fs/notify/fanotify/fanotify_user.c in the Linux kernel through 3.9.4 does not initialize a certain structure member, which allows local users to obtain sensitive information from kernel memory via a read operation on the fanotify descriptor. (CVE-2013-2148) Format string vulnerability in the register_disk function in block/genhd.c in the Linux kernel through 3.9.4 allows local users to gain privileges by leveraging root access and writing format string specifiers to /sys/module/md_mod/parameters/new_array in order to create a crafted /dev/md device name. (CVE-2013-2851) The mmc_ioctl_cdrom_read_data function in drivers/cdrom/cdrom.c in the Linux kernel through 3.10 allows local users to obtain sensitive information from kernel memory via a read operation on a malfunctioning CD-ROM drive. (CVE-2013-2164) The key_notify_policy_flush function in net/key/af_key.c in the Linux kernel before 3.9 does not initialize a certain structure member, which allows local users to obtain sensitive information from kernel heap memory by reading a broadcast message from the notify_policy interface of an IPSec key_socket. (CVE-2013-2237) The (1) key_notify_sa_flush and (2) key_notify_policy_flush functions in net/key/af_key.c in the Linux kernel before 3.10 do not initialize certain structure members, which allows local users to obtain sensitive information from kernel heap memory by reading a broadcast message from the notify interface of an IPSec key_socket. (CVE-2013-2234) The ip6_sk_dst_check function in net/ipv6/ip6_output.c in the Linux kernel before 3.10 allows local users to cause a denial of service (system crash) by using an AF_INET6 socket for a connection to an IPv4 interface. (CVE-2013-2232) The online_pages function in mm/memory_hotplug.c in the Linux kernel before 3.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact in opportunistic circumstances by using memory that was hot-added by an administrator. (CVE-2012-5517) Format string vulnerability in the b43_request_firmware function in drivers/net/wireless/b43/main.c in the Broadcom B43 wireless driver in the Linux kernel through 3.9.4 allows local users to gain privileges by leveraging root access and including format string specifiers in an fwpostfix modprobe parameter, leading to improper construction of an error message. (CVE-2013-2852) The ftrace implementation in the Linux kernel before 3.8.8 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging the CAP_SYS_ADMIN capability for write access to the (1) set_ftrace_pid or (2) set_graph_function file, and then making an lseek system call. (CVE-2013-3301) The pciback_enable_msi function in the PCI backend driver (drivers/xen/pciback/conf_space_capability_msi.c) in Xen for the Linux kernel 2.6.18 and 3.8 allows guest OS users with PCI device access to cause a denial of service via a large number of kernel log messages. NOTE: some of these details are obtained from third-party information. (CVE-2013-0231) The chase_port function in drivers/usb/serial/io_ti.c in the Linux kernel before 3.7.4 allows local users to cause a denial of service (NULL pointer dereference and system crash) via an attempted /dev/ttyUSB read or write operation on a disconnected Edgeport USB serial converter. (CVE-2013-1774) Heap-based buffer overflow in the iscsi_add_notunderstood_response function in drivers/target/iscsi/iscsi_target_parameters.c in the iSCSI target subsystem in the Linux kernel through 3.9.4 allows remote attackers to cause a denial of service (memory corruption and OOPS) or possibly execute arbitrary code via a long key that is not properly handled during construction of an error-response packet. (CVE-2013-2850) The updated packages provides a solution for these security issues. last seen 2020-06-01 modified 2020-06-02 plugin id 67254 published 2013-07-12 reporter This script is Copyright (C) 2013-2019 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/67254 title Mandriva Linux Security Advisory : kernel (MDVSA-2013:194) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2013-1264.NASL description Updated kernel-rt packages that fix several security issues and multiple bugs are now available for Red Hat Enterprise MRG 2.3. The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issues : * A heap-based buffer overflow flaw was found in the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 76665 published 2014-07-22 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/76665 title RHEL 6 : MRG (RHSA-2013:1264) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2014-3002.NASL description The remote Oracle Linux host is missing a security update for the Unbreakable Enterprise kernel package(s). last seen 2020-06-01 modified 2020-06-02 plugin id 72472 published 2014-02-13 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/72472 title Oracle Linux 6 : Unbreakable Enterprise kernel (ELSA-2014-3002) NASL family Fedora Local Security Checks NASL id FEDORA_2013-9123.NASL description Rebase to 3.9.8 now that 3.8 is no longer maintained. 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 2013-07-12 plugin id 67351 published 2013-07-12 reporter This script is Copyright (C) 2013-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/67351 title Fedora 17 : kernel-3.9.8-100.fc17 (2013-9123) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-1844-1.NASL description Kees Cook discovered a flaw in the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 66712 published 2013-05-31 reporter Ubuntu Security Notice (C) 2013-2019 Canonical, Inc. / NASL script (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/66712 title Ubuntu 12.04 LTS : linux vulnerability (USN-1844-1) NASL family SuSE Local Security Checks NASL id SUSE_11_KERNEL-130525.NASL description The SUSE Linux Enterprise 11 SP2 kernel has been updated to fix a critical security issue. - Incorrect strncpy usage in the network listening part of the iscsi target driver could have been used by remote attackers to crash the kernel or execute code. (CVE-2013-2850) This required the iscsi target running on the machine and the attacker able to make a network connection to it (aka not filtered by firewalls). last seen 2020-06-05 modified 2013-06-02 plugin id 66742 published 2013-06-02 reporter This script is Copyright (C) 2013-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/66742 title SuSE 11.2 Security Update : Linux kernel (SAT Patch Numbers 7763 / 7766 / 7767) NASL family OracleVM Local Security Checks NASL id ORACLEVM_OVMSA-2017-0057.NASL description The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2017-0057 for details. last seen 2020-06-01 modified 2020-06-02 plugin id 99163 published 2017-04-03 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/99163 title OracleVM 3.3 : Unbreakable / etc (OVMSA-2017-0057) (Dirty COW) NASL family SuSE Local Security Checks NASL id OPENSUSE-2013-813.NASL description The Linux kernel was updated to 3.4.63, fixing various bugs and security issues. - Linux 3.4.59 (CVE-2013-2237 bnc#828119). - Linux 3.4.57 (CVE-2013-2148 bnc#823517). - Linux 3.4.55 (CVE-2013-2232 CVE-2013-2234 CVE-2013-4162 CVE-2013-4163 bnc#827749 bnc#827750 bnc#831055 bnc#831058). - Drivers: hv: util: Fix a bug in util version negotiation code (bnc#838346). - vmxnet3: prevent div-by-zero panic when ring resizing uninitialized dev (bnc#833321). - bnx2x: protect different statistics flows (bnc#814336). - bnx2x: Avoid sending multiple statistics queries (bnc#814336). - Drivers: hv: util: Fix a bug in version negotiation code for util services (bnc#828714). - Update Xen patches to 3.4.53. - netfront: fix kABI after last seen 2020-06-05 modified 2014-06-13 plugin id 75184 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/75184 title openSUSE Security Update : kernel (openSUSE-SU-2013:1619-1) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-1845-1.NASL description Kees Cook discovered a flaw in the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 66713 published 2013-05-31 reporter Ubuntu Security Notice (C) 2013-2019 Canonical, Inc. / NASL script (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/66713 title Ubuntu 12.04 LTS : linux-lts-quantal vulnerability (USN-1845-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2013-483.NASL description The openSUSE 12.1 kernel was updated to fix a critical security issue and also some reiserfs bugs. CVE-2013-2850: Incorrect strncpy usage in the network listening part of the iscsi target driver could have been used by remote attackers to crash the kernel or execute code. This required the iscsi target running on the machine and the attacker able to make a network connection to it (aka not filtered by firewalls). Bugs : - reiserfs: fix spurious multiple-fill in reiserfs_readdir_dentry (bnc#822722). - reiserfs: fix problems with chowning setuid file w/ xattrs (bnc#790920). last seen 2020-06-05 modified 2014-06-13 plugin id 75024 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/75024 title openSUSE Security Update : kernel (openSUSE-SU-2013:1005-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2013-512.NASL description The openSUSE 12.2 kernel was updated to fix security issue and other bugs. Security issues fixed: CVE-2013-2850: Incorrect strncpy usage in the network listening part of the iscsi target driver could have been used by remote attackers to crash the kernel or execute code. This required the iscsi target running on the machine and the attacker able to make a network connection to it (aka not filtered by firewalls). CVE-2013-2094: The perf_swevent_init function in kernel/events/core.c in the Linux kernel used an incorrect integer data type, which allowed local users to gain privileges via a crafted perf_event_open system call. CVE-2013-0290: The __skb_recv_datagram function in net/core/datagram.c in the Linux kernel did not properly handle the MSG_PEEK flag with zero-length data, which allowed local users to cause a denial of service (infinite loop and system hang) via a crafted application. Bugs fixed : - reiserfs: fix spurious multiple-fill in reiserfs_readdir_dentry (bnc#822722). - reiserfs: fix problems with chowning setuid file w/ xattrs (bnc#790920). - qlge: fix dma map leak when the last chunk is not allocated (bnc#819519). - Update config files: disable UCB1400 on all but ARM Currently UCB1400 is only used on ARM OMAP systems, and part of the code is dead code that can last seen 2020-06-05 modified 2014-06-13 plugin id 75048 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/75048 title openSUSE Security Update : kernel (openSUSE-SU-2013:1042-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2013-513.NASL description The openSUSE 12.3 kernel was updated to fix a critical security issue and two reiserfs bugs. CVE-2013-2850: Incorrect strncpy usage in the network listening part of the iscsi target driver could have been used by remote attackers to crash the kernel or execute code. This required the iscsi target running on the machine and the attacker able to make a network connection to it (aka not filtered by firewalls). Bugs fixed : - reiserfs: fix spurious multiple-fill in reiserfs_readdir_dentry (bnc#822722). - reiserfs: fix problems with chowning setuid file w/ xattrs (bnc#790920). - iscsi-target: fix heap buffer overflow on error (CVE-2013-2850, bnc#821560). last seen 2020-06-05 modified 2014-06-13 plugin id 75049 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/75049 title openSUSE Security Update : kernel (openSUSE-SU-2013:1043-1) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-1846-1.NASL description Kees Cook discovered a flaw in the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 66714 published 2013-05-31 reporter Ubuntu Security Notice (C) 2013-2019 Canonical, Inc. / NASL script (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/66714 title Ubuntu 12.10 : linux vulnerability (USN-1846-1)
Redhat
rpms |
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Seebug
bulletinFamily | exploit |
description | CVE ID: CVE-2013-2850 Linux Kernel是一款开源的操作系统。 Linux iSCSI子系统存在一个基于堆的缓冲区溢出,允许远程攻击者利用漏洞发送特制请求获得内核执行控制。 在处理超大key时"iscsi_add_notunderstood_response()"函数(drivers/target/iscsi/iscsi_target_parameters.c)存在一个边界错误,允许攻击者发送超过64字节的KEY触发漏洞,可以以应用程序上下文执行任意代码。 要成功利用漏洞需要配置了iSCSI target并监听网络。 0 Linux Kernel 3.0.x Linux Kernel 3.2.x Linux Kernel 3.4.x Linux Kernel 3.9.x 厂商解决方案 用户可参考如下厂商提供的安全公告获得补丁信息: http://git.kernel.org/cgit/linux/kernel/git/nab/target-pending.git/commit/?id=cea4dcfdad926a27a18e188720efe0f2c9403456 |
id | SSV:60825 |
last seen | 2017-11-19 |
modified | 2013-06-03 |
published | 2013-06-03 |
reporter | Root |
title | Linux Kernel "iscsi_add_notunderstood_response()"缓冲区溢出漏洞 |
References
- http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00011.html
- http://www.openwall.com/lists/oss-security/2013/06/01/2
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=cea4dcfdad926a27a18e188720efe0f2c9403456
- http://lists.opensuse.org/opensuse-security-announce/2013-05/msg00017.html
- http://www.ubuntu.com/usn/USN-1844-1
- http://www.ubuntu.com/usn/USN-1846-1
- https://github.com/torvalds/linux/commit/cea4dcfdad926a27a18e188720efe0f2c9403456
- https://bugzilla.redhat.com/show_bug.cgi?id=968036
- http://www.ubuntu.com/usn/USN-1845-1
- http://www.ubuntu.com/usn/USN-1847-1
- http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00017.html