Vulnerabilities > CVE-2017-18249 - Race Condition vulnerability in Linux Kernel
Attack vector
LOCAL Attack complexity
MEDIUM Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
The add_free_nid function in fs/f2fs/node.c in the Linux kernel before 4.12 does not properly track an allocated nid, which allows local users to cause a denial of service (race condition) or possibly have unspecified other impact via concurrent threads.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leveraging Race Conditions This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
- Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.
Nessus
NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-1855-1.NASL description The SUSE Linux Enterprise 12 SP2 LTSS kernel was updated receive various security and bugfixes. The following security bugs were fixed : - CVE-2018-5848: In the function wmi_set_ie(), the length validation code did not handle unsigned integer overflow properly. As a result, a large value of the last seen 2020-06-01 modified 2020-06-02 plugin id 110838 published 2018-07-02 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/110838 title SUSE SLES12 Security Update : kernel (SUSE-SU-2018:1855-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-0901-1.NASL description The SUSE Linux Enterprise 12 SP3 Azure kernel was updated to 4.4.176 to receive various security and bugfixes. The following security bugs were fixed : CVE-2019-2024: A use-after-free when disconnecting a source was fixed which could lead to crashes. bnc#1129179). CVE-2019-9213: expand_downwards in mm/mmap.c lacked a check for the mmap minimum address, which made it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task (bnc#1128166). CVE-2019-6974: kvm_ioctl_create_device in virt/kvm/kvm_main.c mishandled reference counting because of a race condition, leading to a use-after-free. (bnc#1124728) CVE-2019-3459, CVE-2019-3460: The Bluetooth stack suffered from two remote information leak vulnerabilities in the code that handles incoming L2cap configuration packets (bsc#1120758). CVE-2019-7221: Fixed a use-after-free vulnerability in the KVM hypervisor related to the emulation of a preemption timer, allowing an guest user/process to crash the host kernel. (bsc#1124732). CVE-2019-7222: Fixed an information leakage in the KVM hypervisor related to handling page fault exceptions, which allowed a guest user/process to use this flaw to leak the host last seen 2020-06-01 modified 2020-06-02 plugin id 123927 published 2019-04-09 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/123927 title SUSE SLES12 Security Update : kernel (SUSE-SU-2019:0901-1) NASL family Slackware Local Security Checks NASL id SLACKWARE_SSA_2019-030-01.NASL description New kernel packages are available for Slackware 14.2 to fix security issues. last seen 2020-03-17 modified 2019-01-31 plugin id 121505 published 2019-01-31 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/121505 title Slackware 14.2 : Slackware 14.2 kernel (SSA:2019-030-01) NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2018-1_0-0165.NASL description An update of 'linux', 'linux-esx' packages of Photon OS has been released. last seen 2019-02-21 modified 2019-02-07 plugin id 111945 published 2018-08-17 reporter Tenable source https://www.tenable.com/plugins/index.php?view=single&id=111945 title Photon OS 1.0: Linux PHSA-2018-1.0-0165 (deprecated) NASL family Debian Local Security Checks NASL id DEBIAN_DLA-1715.NASL description Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2017-18249 A race condition was discovered in the disk space allocator of F2FS. A user with access to an F2FS volume could use this to cause a denial of service or other security impact. CVE-2018-1128, CVE-2018-1129 The cephx authentication protocol used by Ceph was susceptible to replay attacks, and calculated signatures incorrectly. These vulnerabilities in the server required changes to authentication that are incompatible with existing clients. The kernel last seen 2020-06-01 modified 2020-06-02 plugin id 122879 published 2019-03-18 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/122879 title Debian DLA-1715-1 : linux-4.9 security update (Spectre) NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2018-1_0-0165_LINUX.NASL description An update of the linux package has been released. last seen 2020-03-17 modified 2019-02-07 plugin id 121860 published 2019-02-07 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/121860 title Photon OS 1.0: Linux PHSA-2018-1.0-0165 NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-1772-1.NASL description The SUSE Linux Enterprise 12 SP3 kernel was updated to 4.4.136 to receive various security and bugfixes. The following security bugs were fixed : - CVE-2018-5848: In the function wmi_set_ie(), the length validation code did not handle unsigned integer overflow properly. As a result, a large value of the last seen 2020-06-01 modified 2020-06-02 plugin id 110660 published 2018-06-22 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/110660 title SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2018:1772-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-1855-2.NASL description The SUSE Linux Enterprise 12 SP2 LTSS kernel was updated receive various security and bugfixes. The following security bugs were fixed : CVE-2018-5848: In the function wmi_set_ie(), the length validation code did not handle unsigned integer overflow properly. As a result, a large value of the last seen 2020-06-01 modified 2020-06-02 plugin id 118272 published 2018-10-22 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118272 title SUSE SLES12 Security Update : kernel (SUSE-SU-2018:1855-2) NASL family SuSE Local Security Checks NASL id OPENSUSE-2018-656.NASL description The openSUSE Leap 42.3 was updated to 4.4.138 to receive various security and bugfixes. The following security bugs were fixed : - CVE-2018-3639: Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB), Variant 4 (bsc#1085308 bsc#1087082) This update improves the previous Spectre Variant 4 fixes and also mitigates them on the ARM architecture. - CVE-2018-3665: The FPU state and registers of x86 CPUs were saved and restored in a lazy fashion, which opened its disclosure by speculative side channel attacks. This has been fixed by replacing the lazy save/restore by eager saving and restoring (bnc#1087086) - CVE-2018-5848: In the function wmi_set_ie(), the length validation code did not handle unsigned integer overflow properly. As a result, a large value of the last seen 2020-06-05 modified 2018-06-22 plugin id 110658 published 2018-06-22 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/110658 title openSUSE Security Update : the Linux Kernel (openSUSE-2018-656) (Spectre) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-1495.NASL description According to the version of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability : - The add_free_nid function in fs/f2fs/node.c in the Linux kernel, before 4.12, doe not properly track an allocated nid. This allows local users to cause a denial of service (race condition) or possibly have unspecified other impacts via concurrent threads.(CVE-2017-18249i1/4%0 Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-03-19 modified 2019-05-13 plugin id 124818 published 2019-05-13 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/124818 title EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1495) NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2018-2_0-0072_LINUX.NASL description An update of the linux package has been released. last seen 2020-03-17 modified 2019-02-07 plugin id 121966 published 2019-02-07 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/121966 title Photon OS 2.0: Linux PHSA-2018-2.0-0072 NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2018-2_0-0072.NASL description An update of 'linux-aws', 'linux', 'linux-esx', 'linux-secure' packages of Photon OS has been released. last seen 2019-02-21 modified 2019-02-07 plugin id 111956 published 2018-08-17 reporter Tenable source https://www.tenable.com/plugins/index.php?view=single&id=111956 title Photon OS 2.0: Linux PHSA-2018-2.0-0072 (deprecated) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3932-2.NASL description USN-3932-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. It was discovered that a race condition existed in the f2fs file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service. (CVE-2017-18249) Wen Xu discovered that the f2fs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13097, CVE-2018-13099, CVE-2018-13100, CVE-2018-14614, CVE-2018-14616) Wen Xu and Po-Ning Tseng discovered that btrfs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613) Vasily Averin and Evgenii Shatokhin discovered that a use-after-free vulnerability existed in the NFS41+ subsystem when multiple network namespaces are in use. A local attacker in a container could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-16884) It was discovered that a use-after-free vulnerability existed in the PPP over L2TP implementation in the Linux kernel. A privileged local attacker could use this to possibly execute arbitrary code. (CVE-2018-9517) Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak in the Bluetooth implementation of the Linux kernel. An attacker within Bluetooth range could use this to expose sensitive information (kernel memory). (CVE-2019-3459, CVE-2019-3460) Jann Horn discovered that the KVM implementation in the Linux kernel contained a use-after-free vulnerability. An attacker in a guest VM with access to /dev/kvm could use this to cause a denial of service (guest VM crash). (CVE-2019-6974) Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the KVM subsystem of the Linux kernel, when using nested virtual machines. A local attacker in a guest VM could use this to cause a denial of service (system crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221) Felix Wilhelm discovered that an information leak vulnerability existed in the KVM subsystem of the Linux kernel, when nested virtualization is used. A local attacker could use this to expose sensitive information (host system memory to a guest VM). (CVE-2019-7222) Jann Horn discovered that the mmap implementation in the Linux kernel did not properly check for the mmap minimum address in some situations. A local attacker could use this to assist exploiting a kernel NULL pointer dereference vulnerability. (CVE-2019-9213) Muyu Yu discovered that the CAN implementation in the Linux kernel in some situations did not properly restrict the field size when processing outgoing frames. A local attacker with CAP_NET_ADMIN privileges could use this to execute arbitrary code. (CVE-2019-3701) Vladis Dronov discovered that the debug interface for the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 123681 published 2019-04-03 reporter Ubuntu Security Notice (C) 2019-2020 Canonical, Inc. / NASL script (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123681 title Ubuntu 14.04 LTS : linux-lts-xenial, linux-aws vulnerabilities (USN-3932-2) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3932-1.NASL description It was discovered that a race condition existed in the f2fs file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service. (CVE-2017-18249) Wen Xu discovered that the f2fs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-13097, CVE-2018-13099, CVE-2018-13100, CVE-2018-14614, CVE-2018-14616) Wen Xu and Po-Ning Tseng discovered that btrfs file system implementation in the Linux kernel did not properly validate metadata. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service (system crash). (CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613) Vasily Averin and Evgenii Shatokhin discovered that a use-after-free vulnerability existed in the NFS41+ subsystem when multiple network namespaces are in use. A local attacker in a container could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-16884) It was discovered that a use-after-free vulnerability existed in the PPP over L2TP implementation in the Linux kernel. A privileged local attacker could use this to possibly execute arbitrary code. (CVE-2018-9517) Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak in the Bluetooth implementation of the Linux kernel. An attacker within Bluetooth range could use this to expose sensitive information (kernel memory). (CVE-2019-3459, CVE-2019-3460) Jann Horn discovered that the KVM implementation in the Linux kernel contained a use-after-free vulnerability. An attacker in a guest VM with access to /dev/kvm could use this to cause a denial of service (guest VM crash). (CVE-2019-6974) Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the KVM subsystem of the Linux kernel, when using nested virtual machines. A local attacker in a guest VM could use this to cause a denial of service (system crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221) Felix Wilhelm discovered that an information leak vulnerability existed in the KVM subsystem of the Linux kernel, when nested virtualization is used. A local attacker could use this to expose sensitive information (host system memory to a guest VM). (CVE-2019-7222) Jann Horn discovered that the mmap implementation in the Linux kernel did not properly check for the mmap minimum address in some situations. A local attacker could use this to assist exploiting a kernel NULL pointer dereference vulnerability. (CVE-2019-9213) Muyu Yu discovered that the CAN implementation in the Linux kernel in some situations did not properly restrict the field size when processing outgoing frames. A local attacker with CAP_NET_ADMIN privileges could use this to execute arbitrary code. (CVE-2019-3701) Vladis Dronov discovered that the debug interface for the Linux kernel last seen 2020-06-01 modified 2020-06-02 plugin id 123680 published 2019-04-03 reporter Ubuntu Security Notice (C) 2019-2020 Canonical, Inc. / NASL script (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123680 title Ubuntu 16.04 LTS : linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities (USN-3932-1)
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=30a61ddf8117c26ac5b295e1233eaa9629a94ca3
- http://www.securitytracker.com/id/1041432
- https://github.com/torvalds/linux/commit/30a61ddf8117c26ac5b295e1233eaa9629a94ca3
- https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html
- https://usn.ubuntu.com/3932-1/
- https://usn.ubuntu.com/3932-2/