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Files Date: 2021-04-16

Ubuntu Security Notice USN-4917-1
Posted Apr 16, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4917-1 - It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux kernel did not properly handle faults in copy_from_user when passing through ioctls to an underlying file system. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-29154, CVE-2021-3492, CVE-2021-3493
MD5 | a63c6add6b05cf17bc9226159741c86f
GetSimple CMS My SMTP Contact 1.1.1 CSRF / Remote Code Execution
Posted Apr 16, 2021
Authored by Bobby Cooke

GetSimple CMS My SMTP Contact plugin versions 1.1.1 and below cross site request forgery to remote code execution exploit.

tags | exploit, remote, code execution, csrf
MD5 | 7d48adbe7385fbb2fa16170c86231d41
Ubuntu Security Notice USN-4916-1
Posted Apr 16, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4916-1 - It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-29154, CVE-2021-3493
MD5 | 51ebf05c69b14b4b5df3a811f767345a
glFTPd 2.11a Denial Of Service
Posted Apr 16, 2021
Authored by xynmaps

glFTPd version 2.11a remote denial of service exploit.

tags | exploit, remote, denial of service
MD5 | 04295a11c4a07b213d22cabfafda8897
Ubuntu Security Notice USN-4915-1
Posted Apr 16, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4915-1 - It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux kernel did not properly handle faults in copy_from_user when passing through ioctls to an underlying file system. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-3492, CVE-2021-3493
MD5 | e276699a6921d022e5692c101be674d3
Linux/x86 execve(/bin/sh) Shellcode
Posted Apr 16, 2021
Authored by s1ege

17 bytes small Linux/x86 execve(/bin/sh) shellcode.

tags | x86, shellcode
systems | linux
MD5 | 1b7f8c231c50bdbd88ccc61b077281f8
Linux/x64 execve(/bin/sh) Shellcode
Posted Apr 16, 2021
Authored by s1ege

21 bytes small Linux/x64 execve(/bin/sh) shellcode.

tags | shellcode
systems | linux
MD5 | 3eb904edf84797c8c3688bec6a97022e
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