Debian Security Advisory DSA 4495-1 (linux - security update)

Published: 2019-08-12 02:00:28
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:M/Au:N/C:C/I:C/A:C

Summary:
The remote host is missing an update for the 'linux' Linux Distribution Package(s) announced via the DSA-4495-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2018-20836 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. CVE-2019-1125 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. CVE-2019-1999 A race condition was discovered in the Android binder driver, which could lead to a use-after-free. If this driver is loaded, a local user might be able to use this for denial-of-service (memory corruption) or for privilege escalation. CVE-2019-10207 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). CVE-2019-10638Amit 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 siphash function is now used instead. CVE-2019-12817 It was discovered that on the PowerPC (ppc64el) architecture, the hash page table (HPT) code did not correctly handle fork() in a process with memory mapped at addresses above 512 TiB. This could lead to a use-after-free in the kernel, or unintended sharing of memory between user processes. A local user could use this for privilege escalation. Systems using the radix MMU, or a custom kernel with a 4 KiB page size, are not affected. CVE-2019-12984 It was discovered that the NFC protocol implementation did not properly validate a netlink control message, potentially leading to a null pointer dereference. A local user on a system with an NFC interface could use this for denial-of-service (BUG/oops). CVE-2019-13233 Jann Horn discovered a race condition on the x86 architecture, in use of the LDT. This could lead to a use-after-free. A local user could possibly use this for denial-of-service. CVE-2019-13631 It was discovered that the gtco driver f ... Description truncated. Please see the references for more information.

Affected Versions:
'linux' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For the stable distribution (buster), these problems have been fixed in version 4.19.37-5+deb10u2. For the oldstable distribution (stretch), these problems will be fixed soon. We recommend that you upgrade your linux Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2018-20836
https://nvd.nist.gov/vuln/detail/CVE-2019-10207
https://nvd.nist.gov/vuln/detail/CVE-2019-10638
https://nvd.nist.gov/vuln/detail/CVE-2019-1125
https://nvd.nist.gov/vuln/detail/CVE-2019-12817
https://nvd.nist.gov/vuln/detail/CVE-2019-12984
https://nvd.nist.gov/vuln/detail/CVE-2019-13233
https://nvd.nist.gov/vuln/detail/CVE-2019-13631
https://nvd.nist.gov/vuln/detail/CVE-2019-13648
https://nvd.nist.gov/vuln/detail/CVE-2019-14283
https://nvd.nist.gov/vuln/detail/CVE-2019-14284
https://nvd.nist.gov/vuln/detail/CVE-2019-1999

References:

https://www.debian.org/security/2019/dsa-4495.html
https://security-tracker.debian.org/tracker/DSA-4495-1

Severity
High
CVSS Score
9.3
Published
2019-08-12
Modified
2019-08-13
Category
Debian Local Security Checks

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