데비안 보안 권고
DSA-4497-1 linux -- 보안 업데이트
- 2019년 08월 13일
- 영향 받는 패키지:
- 보안 데이터베이스 참조:
- Mitre의 CVE 사전: CVE-2015-8553, CVE-2017-18509, CVE-2018-5995, CVE-2018-20836, CVE-2018-20856, CVE-2019-1125, CVE-2019-3882, CVE-2019-3900, CVE-2019-10207, CVE-2019-10638, CVE-2019-10639, CVE-2019-13631, CVE-2019-13648, CVE-2019-14283, CVE-2019-14284, CVE-2019-15239.
- 추가 정보:
권한 상승, 서비스 거부 또는 정보 유출을 일으킬 수 있는 여러 취약점을 리눅스 커널에서 발견했습니다.
Jan Beulich discovered that CVE-2015-2150 was not completely addressed. If a PCI physical function is passed through to a Xen guest, the guest is able to access its memory and I/O regions before enabling decoding of those regions. This could result in a denial-of-service (unexpected NMI) on the host.
The fix for this is incompatible with qemu versions before 2.5.
Denis Andzakovic reported a missing type check in the IPv4 multicast routing implementation. A user with the CAP_NET_ADMIN capability (in any user namespace) could use this for denial-of-service (memory corruption or crash) or possibly for privilege escalation.
ADLab of VenusTech discovered that the kernel logged the virtual addresses assigned to per-CPU data, which could make it easier to exploit other vulnerabilities.
chenxiang reported a race condition in libsas, the kernel subsystem supporting Serial Attached SCSI (SAS) devices, which could lead to a use-after-free. It is not clear how this might be exploited.
Xiao Jin reported a potential double-free in the block subsystem, in case an error occurs while initialising the I/O scheduler for a block device. It is not clear how this might be exploited.
It was discovered that most x86 processors could speculatively skip a conditional SWAPGS instruction used when entering the kernel from user mode, and/or could speculatively execute it when it should be skipped. This is a subtype of Spectre variant 1, which could allow local users to obtain sensitive information from the kernel or other processes. It has been mitigated by using memory barriers to limit speculative execution. Systems using an i386 kernel are not affected as the kernel does not use SWAPGS.
It was found that the vfio implementation did not limit the number of DMA mappings to device memory. A local user granted ownership of a vfio device could use this to cause a denial of service (out-of-memory condition).
It was discovered that vhost drivers did not properly control the amount of work done to service requests from guest VMs. A malicious guest could use this to cause a denial-of-service (unbounded CPU usage) on the host.
The syzkaller tool found a potential null dereference in various drivers for UART-attached Bluetooth adapters. A local user with access to a pty device or other suitable tty device could use this for denial-of-service (BUG/oops).
Amit Klein and Benny Pinkas discovered that the generation of IP packet IDs used a weak hash function,
jhash. This could enable tracking individual computers as they communicate with different remote servers and from different networks. The
siphashfunction is now used instead.
Amit Klein and Benny Pinkas discovered that the generation of IP packet IDs used a weak hash function that incorporated a kernel virtual address. This hash function is no longer used for IP IDs, although it is still used for other purposes in the network stack.
It was discovered that the gtco driver for USB input tablets could overrun a stack buffer with constant data while parsing the device's descriptor. A physically present user with a specially constructed USB device could use this to cause a denial-of-service (BUG/oops), or possibly for privilege escalation.
Praveen Pandey reported that on PowerPC (ppc64el) systems without Transactional Memory (TM), the kernel would still attempt to restore TM state passed to the sigreturn() system call. A local user could use this for denial-of-service (oops).
The syzkaller tool found a missing bounds check in the floppy disk driver. A local user with access to a floppy disk device, with a disk present, could use this to read kernel memory beyond the I/O buffer, possibly obtaining sensitive information.
The syzkaller tool found a potential division-by-zero in the floppy disk driver. A local user with access to a floppy disk device could use this for denial-of-service (oops).
- (CVE ID not yet assigned)
Denis Andzakovic reported a possible use-after-free in the TCP sockets implementation. A local user could use this for denial-of-service (memory corruption or crash) or possibly for privilege escalation.
- (CVE ID not yet assigned)
The netfilter conntrack subsystem used kernel addresses as user-visible IDs, which could make it easier to exploit other security vulnerabilities.
Julien Grall reported that Linux does not limit the amount of memory which a domain will attempt to balloon out, nor limits the amount of "foreign / grant map" memory which any individual guest can consume, leading to denial of service conditions (for host or guests).
옛 안정 배포(stretch)에서, 이 문제를 버전 4.9.168-1+deb9u5에서 고침.
안정 배포(buster)에서, 이 문제를 버전 4.19.37-5+deb10u2 또는 이전에 고침.
linux 패키지를 업그레이드 하는 게 좋습니다.
linux의 자세한 보안 상태는 보안 추적 페이지 참조: https://security-tracker.debian.org/tracker/linux