SB2018081714 - OpenSUSE Linux update for qemu

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Main Vulnerability Database SB2018081714

SB2018081714 - OpenSUSE Linux update for qemu

Published: August 17, 2018

Security Bulletin ID SB2018081714
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 33% Low 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Heap-based buffer overflow (CVE-ID: CVE-2018-11806)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The vulnerability exists due to heap-based buffer overflow when insufficient input and validation checking of Slirp networking back-end processes by the m_cat function, as defined in the slirp/mbuf.c source code file. A remote attacker can send malformed, fragmented packets, trigger memory corruption and cause the QEMU process to crash.


2) Speculative Store Bypass (CVE-ID: CVE-2018-3639)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists due to race conditions in CPU cache processing. A local attacker can conduct a side-channel attack to exploit a flaw in the speculative execution of Load and Store instructions to read privileged memory.

Note: the vulnerability is referred to as "Spectre variant 4".

3) Memory corruption (CVE-ID: CVE-2018-7550)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows an adjacent attacker to execute arbitrary code on the target system.

The weakness exists in the load_multiboot function due to out-of-bounds read or write. An adjacent attacker can load a kernel image during the boot process, which may cause the mh_load_end_addr address to be greater than the mh_bss_end_addr address, trigger memory corruption and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Remediation

Install update from vendor's website.

References