An information leakage flaw is found in the way Linux kernel saves and restores Floating Point Unit(FPU) state during task switch. There are two ways, one is to save & restore FPU state during task context switch. And second is to defer FPU state save & restore until an FP instruction is invoked by the current task. First is called as "Eager FPU Restore" and second is known as "Lazy FPU Restore" scheme.
Linux kernel which follows the "Lazy FPU Restore" scheme is vulnerable to the FPU state information leakage issue. An unprivileged local attacker could use this flaw to read FPU state bits by conducting targeted cache side-channel attacks, similar to Meltdown attack disclosed earlier this year.
Upstream fix: ------------- -> https://git.kernel.org/linus//58122bf1d856a4ea9581d62a07c557d997d46a19
References: ----------- -> http://www.openwall.com/lists/oss-security/2018/06/13/7
CUPS. An issue existed in CUPS. This issue was addressed with improved access restrictions.
A vulnerability in Bluetooth pairing potentially allows an attacker with physical proximity (within 30 meters) to gain unauthorized access via an adjacent network, intercept traffic and send forged pairing messages between two vulnerable Bluetooth devices. This may result in information disclosure, elevation of privilege and/or denial of service.
External References:
https://www.kb.cert.org/vuls/id/304725 https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00128.html https://www.bluetooth.com/news/unknown/2018/07/bluetooth-sig-security-update
If a script accepts an external input and outputs it without modification as a part of HTTP responses, an attacker can use newline characters to deceive the clients that the HTTP response header is stopped at there, and can inject fake HTTP responses after the newline characters to show malicious contents to the clients.
Affected versions:
Ruby 2.2 series: 2.2.9 and earlier Ruby 2.3 series: 2.3.6 and earlier Ruby 2.4 series: 2.4.3 and earlier Ruby 2.5 series: 2.5.0 and earlier
External References:
https://www.ruby-lang.org/en/news/2018/03/28/http-response-splitting-in-webrick-cve-2017-17742/
An integer overflow flaw was found in the ICU component of the Chromium browser.
Upstream bug(s):
https://code.google.com/p/chromium/issues/detail?id=774382
External References:
https://chromereleases.googleblog.com/2017/12/stable-channel-update-for-desktop.html
An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimization). There are three primary variants of the issue which differ in the way the speculative execution can be exploited.
Variant CVE-2017-5754 relies on the fact that, on impacted microprocessors, during speculative execution of instruction permission faults, exception generation triggered by a faulting access is suppressed until the retirement of the whole instruction block. In a combination with the fact that memory accesses may populate the cache even when the block is being dropped and never committed (executed), an unprivileged local attacker could use this flaw to read privileged (kernel space) memory by conducting targeted cache side-channel attacks.
Note: CVE-2017-5754 affects Intel x86-64 microprocessors. AMD x86-64 microprocessors are not affected by this issue.
An issue was discovered in certain Apple products. macOS before 10.13 is affected. The issue involves the "Application Firewall" component. It allows remote attackers to bypass intended settings in opportunistic circumstances by leveraging incorrect handling of a denied setting after an upgrade.
An issue was discovered in certain Apple products. macOS before 10.13 is affected. The issue involves the "AppSandbox" component. It allows attackers to cause a denial of service via a crafted app.
An issue was discovered in certain Apple products. macOS before 10.13 is affected. The issue involves the "IOFireWireFamily" component. It allows attackers to bypass intended memory-read restrictions via a crafted app.
An issue was discovered in certain Apple products. iOS before 11 is affected. macOS before 10.13 is affected. The issue involves the "Mail Drafts" component. It allows remote attackers to obtain sensitive information by reading unintended cleartext transmissions.
An issue was discovered in certain Apple products. iOS before 11 is affected. macOS before 10.13 is affected. tvOS before 11 is affected. watchOS before 4 is affected. The issue involves the "CFNetwork Proxies" component. It allows remote attackers to cause a denial of service.
A new exploitation technique called key reinstallation attacks used to break Wi-Fi handshakes that negotiate session keys was discovered. These attacks target the Wi-Fi/WPA2 standard. An adversary can trick a client or Access Point (AP) into reinstalling an already-in use pairwise key in 4-way handshake. While reinstalling the already in-use key, the associated packet number (sometimes also called nonce) and receive replay counter is reset. This causes nonce reuse, voiding any security the underlying encryption protocol is supposed to provide. For example, it allows decryption or injection of frames, and enables an attacker to replay frames.
If an X.509 certificate has a malformed IPAddressFamily extension, OpenSSL could do a one-byte buffer overread. The most likely result would be an erroneous display of the certificate in text format.
External References:
https://www.openssl.org/news/secadv/20170828.txt
References:
https://github.com/openssl/openssl/pull/4276
curl. An out-of-bounds read was addressed with improved bounds checking.
curl supports "globbing" of URLs, in which a user can pass a numerical range to have the tool iterate over those numbers to do a sequence of transfers.
In the globbing function that parses the numerical range, there was an omission that made curl read a byte beyond the end of the URL if given a carefully crafted, or just wrongly written, URL. The URL is stored in a heap based buffer, so it could then be made to wrongly read something else instead of crashing.
Affected versions: curl 7.34.0 up to and including 7.54.1
This flaw only affects the curl command line tool, not the libcurl library.
DISPUTED libxml2 2.9.4, when used in recover mode, allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted XML document. NOTE: The maintainer states "I would disagree of a CVE with the Recover parsing option which should only be used for manual recovery at least for XML parser."
ntp. Multiple issues were addressed by updating to version 4.2.8p10
A vulnerability found in the NTP server allows an authenticated remote attacker to crash the daemon by sending an invalid setting via the :config directive. The unpeer option expects a number or an address as an argument. In case the value is "0", a segmentation fault occurs.
Affects: All versions of ntp, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not including ntp-4.3.94.
Mitigation:
Properly monitor your ntpd instances, and auto-restart ntpd (without -g) if it stops running.
A vulnerability found in the NTP server makes it possible for an authenticated remote user to crash ntpd via a malformed mode configuration directive.
Mitigation:
Properly monitor your ntpd instances, and auto-restart ntpd (without -g) if it stops running.