Vulnerabilities > CVE-2012-2127 - 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
fs/proc/root.c in the procfs implementation in the Linux kernel before 3.2 does not properly interact with CLONE_NEWPID clone system calls, which allows remote attackers to cause a denial of service (reference leak and memory consumption) by making many connections to a daemon that uses PID namespaces to isolate clients, as demonstrated by vsftpd.
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 Ubuntu Local Security Checks NASL id UBUNTU_USN-1607-1.NASL description Vadim Ponomarev discovered a flaw in the Linux kernel causing a reference leak when PID namespaces are used. A remote attacker could exploit this flaw causing a denial of service. (CVE-2012-2127) A flaw was found in how the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 62514 published 2012-10-12 reporter Ubuntu Security Notice (C) 2012-2019 Canonical, Inc. / NASL script (C) 2012-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/62514 title Ubuntu 11.10 : linux vulnerabilities (USN-1607-1) NASL family SuSE Local Security Checks NASL id SUSE_11_KERNEL-120523.NASL description The SUSE Linux Enterprise 11 SP2 kernel was updated to 3.0.31, fixing many bugs and security issues. Various security and bug fixes contained in the Linux 3.0 stable releases 3.0.27 up to 3.0.31 have been included, but are not explicitly listed below. The following notable security issues have been fixed : - The dl2k network card driver lacked permission handling for some ethtool ioctls, which could allow local attackers to start/stop the network card. (CVE-2012-2313) - A use after free bug in hugetlb support could be used by local attackers to crash the system. (CVE-2012-2133) - Various leaks in namespace handling over fork where fixed, which could be exploited by e.g. vsftpd access by remote users. (CVE-2012-2127) - A memory corruption when mounting a hfsplus filesystem was fixed that could be used by local attackers able to mount filesystem to crash the system. (CVE-2012-2319) The following non security bugs have been fixed by this update : - BTRFS - Partial revert of truncation improvements. - Fix eof while discarding extents. - Check return value of bio_alloc() properly. - Return void from clear_state_bit. - Avoid possible use-after-free in clear_extent_bit(). - Make free_ipath() deal gracefully with NULL pointers. - Do not call free_extent_buffer twice in iterate_irefs. - Add missing read locks in backref.c. - Fix max chunk size check in chunk allocator. - Double unlock bug in error handling. - Do not return EINTR. - Fix btrfs_ioctl_dev_info() crash on missing device. - Fix that check_int_data mount option was ignored. - Do not mount when we have a sectorsize unequal to PAGE_SIZE. - Avoid possible use-after-free in clear_extent_bit(). - Retrurn void from clear_state_bit. - Fix typo in free-space-cache.c. - Remove the ideal caching code. - Remove search_start and search_end from find_free_extent and callers. - Adjust the write_lock_level as we unlock. - Actually call btrfs_init_lockdep. - Fix regression in scrub path resolving. - Show useful info in space reservation tracepoint. - Flush out and clean up any block device pages during mount. - Fix deadlock during allocating chunks. - Fix race between direct io and autodefrag. - Fix the mismatch of page->mapping. - Fix recursive defragment with autodefrag option. - Add a check to decide if we should defrag the range. - Do not bother to defrag an extent if it is a big real extent. - Update to the right index of defragment. - Fix use-after-free in __btrfs_end_transaction. - Stop silently switching single chunks to raid0 on balance. - Add wrappers for working with alloc profiles. - Make profile_is_valid() check more strict. - Move alloc_profile_is_valid() to volumes.c. - Add get_restripe_target() helper. - Add __get_block_group_index() helper. - Improve the logic in btrfs_can_relocate(). - Validate target profiles only if we are going to use them. - Allow dup for data chunks in mixed mode. - Fix memory leak in resolver code. - Fix infinite loop in btrfs_shrink_device(). - Error handling locking fixu. - Fix uninit variable in repair_eb_io_failure. - Always store the mirror we read the eb from. - Do not count CRC or header errors twice while scrubbing. - Do not start delalloc inodes during sync. - Fix repair code for RAID10. - Prevent root_list corruption. - Fix block_rsv and space_info lock ordering. - Fix space checking during fs resize. - Avoid deadlocks from GFP_KERNEL allocations during btrfs_real_readdir(). - Reduce lock contention during extent insertion. - Add properly locking around add_root_to_dirty_list(). - Fix mismatching struct members in ioctl.h. - netfilter : - nf_conntrack: make event callback registration per netns. - DRM : - edid: Add a workaround for 1366x768 HD panel. - edid: Add extra_modes. - edid: Add packed attribute to new gtf2 and cvt structs. - edid: Add the reduced blanking DMT modes to the DMT list - edid: Allow drm_mode_find_dmt to hunt for reduced-blanking modes. - edid: Do drm_dmt_modes_for_range() for all range descriptor types. - edid: Document drm_mode_find_dmt. - edid: Fix some comment typos in the DMT mode list - edid: Generate modes from extra_modes for range descriptors - edid: Give the est3 mode struct a real name. - edid: Remove a misleading comment. - edid: Rewrite drm_mode_find_dmt search loop. - edid: Update range descriptor struct for EDID 1.4 - edid: add missing NULL checks. - edid: s/drm_gtf_modes_for_range/drm_dmt_modes_for_range/ - Fix kABI for drm EDID improvement patches. - Fix the case where multiple modes are returned from EDID - i915: Add more standard modes to LVDS output. - i915: Disable LVDS at mode change. - i915: add Ivy Bridge GT2 Server entries. - i915: delay drm_irq_install() at resume. - EDD: Check for correct EDD 3.0 length. - XEN - blkfront: make blkif_io_lock spinlock per-device. - blkback: streamline main processing loop (fate#309305). - blkback: Implement discard requests handling (fate#309305). - blkback: Enhance discard support with secure erasing support (fate#309305). - blkfront: Handle discard requests (fate#309305). - blkfront: Enhance discard support with secure erasing support (fate#309305). - blkif: support discard (fate#309305). - blkif: Enhance discard support with secure erasing support (fate#309305). - xen/smpboot: adjust ordering of operations. - x86-64: provide a memset() that can deal with 4Gb or above at a time. - Update Xen patches to 3.0.27. - Update Xen patches to 3.0.31. - xen: fix VM_FOREIGN users after c/s 878:eba6fe6d8d53. - xen/gntdev: fix multi-page slot allocation. - TG3 - Avoid panic from reserved statblk field access. - Fix 5717 serdes powerdown problem. - Fix RSS ring refill race condition. - Fix single-vector MSI-X code. - fix ipv6 header length computation. - S/390 - dasd: Fix I/O stall when reserving dasds. - af_iucv: detect down state of HS transport interface (LTC#80859). - af_iucv: allow shutdown for HS transport sockets (LTC#80860). - mm: s390: Fix BUG by using __set_page_dirty_no_writeback on swap. - qeth: Improve OSA Express 4 blkt defaults (LTC#80325). - zcrypt: Fix parameter checking for ZSECSENDCPRB ioctl (LTC#80378). - zfcpdump: Implement async sdias event processing (LTC#81330). - ALSA - hda: Always resume the codec immediately. - hda: Add Creative CA0132 HDA codec support. - hda: Fix error handling in patch_ca0132.c. - hda: Add the support for Creative SoundCore3D. - OTHER - ixgbe: fix ring assignment issues for SR-IOV and drop cases. - ixgbe: add missing rtnl_lock in PM resume path. - MCE, AMD: Drop too granulary family model checks. - EDAC, MCE, AMD: Print CPU number when reporting the error. - EDAC, MCE, AMD: Print valid addr when reporting an error. - libata: skip old error history when counting probe trials. - x86: kdb: restore kdb stack trace. - ehea: fix allmulticast support, - ehea: fix promiscuous mode. - ehea: only register irq after setting up ports. - ehea: fix losing of NEQ events when one event occurred early. - scsi: Silence unnecessary warnings about ioctl to partition. - scsi_dh_rdac: Update match function to check page C8. - scsi_dh_rdac: Add new NetApp IDs. - bluetooth: Add support for Foxconn/Hon Hai AR5BBU22 0489:E03C. - x86/amd: Add missing feature flag for fam15h models 10h-1fh processors. - x86: Report cpb and eff_freq_ro flags correctly. - x86, amd: Fix up numa_node information for AMD CPU family 15h model 0-0fh northbridge functions. - x86/PCI: amd: Kill misleading message about enablement of IO access to PCI ECS. - cdc-wdm: fix race leading leading to memory corruption. - tlan: add cast needed for proper 64 bit operation. - bonding:update speed/duplex for NETDEV_CHANGE. - bonding: comparing a u8 with -1 is always false. - bonding: start slaves with link down for ARP monitor. - bonding: do not increase rx_dropped after processing LACPDUs - x86: fix the initialization of physnode_map. - sched,rt: fix isolated CPUs leaving root_task_group indefinitely throttled. - Fix SLE11-SP1->SLE11-SP2 interrupt latency regression. Note that this change trades an approximately 400% latency regression fix for power consumption progression that skew removal bought (at high cost). - Revert mainline 0209f649 - rcu: limit rcu_node leaf-level fanout. - md: fix possible corruption of array metadata on shutdown. - md/bitmap: prevent bitmap_daemon_work running while initialising bitmap. - md: ensure changes to write-mostly are reflected in metadata. - cciss: Add IRQF_SHARED back in for the non-MSI(X) interrupt handler. - procfs, namespace, pid_ns: fix leakage upon fork() failure. - mqueue: fix a vfsmount longterm reference leak. - procfs: fix a vfsmount longterm reference leak. - scsi_dh_alua: Optimize stpg command. - scsi_dh_alua: Store pref bit from RTPG. - scsi_dh_alua: set_params interface. - uwb: fix error handling. - uwb: fix use of del_timer_sync() in interrupt. - usbhid: fix error handling of not enough bandwidth. - mm: Improve preservation of page-age information - pagecache limit: Fix the shmem deadlock. - USB: sierra: add support for Sierra Wireless MC7710. - USB: fix resource leak in xhci power loss path. - x86/iommu/intel: Fix identity mapping for sandy bridge. - ipv6: Check dest prefix length on original route not copied one in rt6_alloc_cow(). - ipv6: do not use inetpeer to store metrics for routes. - ipv6: fix problem with expired dst cache. - ipv6: unshare inetpeers. - bridge: correct IPv6 checksum after pull. - scsi: storvsc: Account for in-transit packets in the RESET path. - patches.fixes/mm-mempolicy.c-fix-pgoff-in-mbind-vma-merg e.patch : - patches.fixes/mm-mempolicy.c-refix-mbind_range-vma-issue .patch: Fix vma merging issue during mbind affecting JVMs. - ACPI, APEI: Fix incorrect APEI register bit width check and usage. - vmxnet3: cap copy length at size of skb to prevent dropped frames on tx. - rt2x00: rt2x00dev: move rfkill_polling register to proper place. - pagecache: fix the BUG_ON safety belt - pagecache: Fixed the GFP_NOWAIT is zero and not suitable for tests bug - igb: reset PHY after recovering from PHY power down. - igb: fix rtnl race in PM resume path. - watchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing. - watchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing redhat#727875). - cfq-iosched: Reduce linked group count upon group destruction. - cdc_ether: Ignore bogus union descriptor for RNDIS devices. - sys_poll: fix incorrect type for timeout parameter. - staging:rts_pstor:Avoid last seen 2020-06-05 modified 2013-01-25 plugin id 64174 published 2013-01-25 reporter This script is Copyright (C) 2013-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/64174 title SuSE 11.2 Security Update : Linux Kernel (SAT Patch Numbers 6338 / 6345 / 6349) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-1594-1.NASL description Vadim Ponomarev discovered a flaw in the Linux kernel causing a reference leak when PID namespaces are used. A remote attacker could exploit this flaw causing a denial of service. (CVE-2012-2127) A flaw was found in how the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 62430 published 2012-10-04 reporter Ubuntu Security Notice (C) 2012-2019 Canonical, Inc. / NASL script (C) 2012-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/62430 title Ubuntu 10.04 LTS : linux-lts-backport-oneiric vulnerabilities (USN-1594-1)
References
- http://www.openwall.com/lists/oss-security/2012/04/22/1
- https://github.com/torvalds/linux/commit/905ad269c55fc62bee3da29f7b1d1efeba8aa1e1
- http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.2.bz2
- https://bugzilla.novell.com/show_bug.cgi?id=757783
- https://bugzilla.redhat.com/show_bug.cgi?id=815188
- http://www.openwall.com/lists/oss-security/2012/04/20/25
- http://www.kernel.org/pub/linux/kernel/v3.x/
- http://ubuntu.com/usn/usn-1607-1
- http://www.ubuntu.com/usn/USN-1594-1
- http://www.securityfocus.com/bid/55774
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=905ad269c55fc62bee3da29f7b1d1efeba8aa1e1