| Description: | Summary:
The remote host is missing an update for the Debian 'linux' package(s) announced via the DLA-609-1 advisory.
Vulnerability Insight:
This update fixes the CVEs described below.
CVE-2016-3857
Chiachih Wu reported two bugs in the ARM OABI compatibility layer that can be used by local users for privilege escalation. The OABI compatibility layer is enabled in all kernel flavours for armel and armhf.
CVE-2016-4470
Wade Mealing of the Red Hat Product Security Team reported that in some error cases the KEYS subsystem will dereference an uninitialised pointer. A local user can use the keyctl() system call for denial of service (crash) or possibly for privilege escalation.
CVE-2016-5696
Yue Cao, Zhiyun Qian, Zhongjie Wang, Tuan Dao, and Srikanth V. Krishnamurthy of the University of California, Riverside, and Lisa M. Marvel of the United States Army Research Laboratory discovered that Linux's implementation of the TCP Challenge ACK feature results in a side channel that can be used to find TCP connections between specific IP addresses, and to inject messages into those connections.
Where a service is made available through TCP, this may allow remote attackers to impersonate another connected user to the server or to impersonate the server to another connected user. In case the service uses a protocol with message authentication (e.g. TLS or SSH), this vulnerability only allows denial of service (connection failure). An attack takes tens of seconds, so short-lived TCP connections are also unlikely to be vulnerable.
This may be mitigated by increasing the rate limit for TCP Challenge ACKs so that it is never exceeded: sysctl net.ipv4.tcp_challenge_ack_limit=1000000000
CVE-2016-5829
Several heap-based buffer overflow vulnerabilities were found in the hiddev driver, allowing a local user with access to a HID device to cause a denial of service or potentially escalate their privileges.
CVE-2016-6136
Pengfei Wang discovered that the audit subsystem has a 'double-fetch' or TOCTTOU bug in its handling of special characters in the name of an executable. Where audit logging of execve() is enabled, this allows a local user to generate misleading log messages.
CVE-2016-6480
Pengfei Wang discovered that the aacraid driver for Adaptec RAID controllers has a 'double-fetch' or TOCTTOU bug in its validation of FIB messages passed through the ioctl() system call. This has no practical security impact in current Debian releases.
CVE-2016-6828
Marco Grassi reported a 'use-after-free' bug in the TCP implementation, which can be triggered by local users. The security impact is unclear, but might include denial of service or privilege escalation.
CVE-2016-7118
Marcin Szewczyk reported that calling fcntl() on a file descriptor for a directory on an aufs filesystem would result in am oops. This allows local users to cause a denial of service. This is a Debian-specific regression introduced in version 3.2.81-1.
For Debian 7 Wheezy, these problems have been fixed in version 3.2.81-2. This version also fixes a build ... [Please see the references for more information on the vulnerabilities]
Affected Software/OS:
'linux' package(s) on Debian 7.
Solution:
Please install the updated package(s).
CVSS Score:
9.3
CVSS Vector:
AV:N/AC:M/Au:N/C:C/I:C/A:C
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