Two Vulnerabilities to be Found at SDL

Two of six serious vulnerabilities in this cross-platform multimedia library create conditions for remote code execution.
04 July 2019   1427

The SDL (Simple Direct Layer) library set, which provides tools for hardware accelerated 2D and 3D graphics rendering, input processing, audio playback, 3D output via OpenGL / OpenGL ES, and many other related operations, revealed 6 vulnerabilities. Including in the SDL2_image library, two problems have been discovered that allow organizing remote code execution in the system. Attacks can be made on applications that use SDL to load images.

Both vulnerabilities (CVE-2019-5051, CVE-2019-5051) are present in the IMG_LoadPCX_RW function and are caused by the lack of the necessary error handler and integer overflow that can be exploited through the transfer of a specially crafted PCX file. Issues have already been fixed in the SDL_image 2.0.5 release. Information about the remaining 4 vulnerabilities has not yet been disclosed.

Vulnerabilities were found by Talos, so you can find more info at their website.

Linux 5.3 Kernel to be Released

Huge amount of updates, improvements, changes and new features awaits all Linux users
17 September 2019   230

After two months of development, Linus Torvalds introduced the Linux 5.3 kernel release. Among the most notable changes: support for AMD Navi GPUs, Zhaoxi processors, and Intel Speed ​​Select power management technology, the ability to use umwait instructions to wait without using loops, increasing the interactivity utilization clamping mode for asymmetric CPUs, the pidfd_open system call, the ability to use IPv4 addresses from the subnet 0.0.0.0/8, the possibility of hardware acceleration of nftables, support for HDR in the DRM subsystem, integration of the ACRN hypervisor.

In the announcement of the new release, Linus reminded all developers of the main rule of kernel development - maintaining the invariance of behavior for user space components. Changes in the kernel should in no way violate already running applications and lead to user-level regressions. At the same time, a violation of behavior can cause not only a change in the ABI, removal of outdated code or errors, but also an indirect effect of correctly working useful improvements. As a good example, the useful optimization in Ext4 code was discarded, which reduces the number of accesses to the drive by disabling the read-ahead inode table for small I / O requests.

Optimization has led to the fact that, due to a decrease in disk activity, the entropy for the random number generator getrandom () began to accumulate more slowly and in some configurations, under certain circumstances, there could be hangs during loading until the entropy pool is full. Since the optimization is really useful, a discussion arose among the developers, in which it was proposed to eliminate the problem by disabling the default blocking mode of the getrandom () call with the addition of an optional flag to wait for entropy, but such a change will affect the quality of random numbers at the initial stage of loading. In the change rollback commit, Linus noted that he plans to bring the optimization back as soon as the problem with getrandom () is resolved.

The new version adopted 15794 patches from 1974 developers, the patch size is 92 MB (the changes affected 13986 files, 258419 lines of code were added, 599137 lines were deleted). About 39% of all the changes presented in 5.3 are related to device drivers, about 12% of changes are related to updating the code specific to hardware architectures, 11% are connected to the network stack, 3% to file systems and 3% to internal kernel subsystems.

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