ctf-writeups

This is a PoC exploit for a double free vulnerability in a binary. The exploit creates overlapping chunks on the heap, manipulates heap metadata, and overwrites the mallochook with a one-gadget address to execute /bin/sh. The challenge is interesting because it does not allow the exploitation of...

SUSE SLES15 Security Update : kernel (SUSE-SU-2020:3764-1)

The SUSE Linux Enterprise 15 SP2 RT kernel was updated to receive various security and bugfixes. The following security bugs were fixed : CVE-2020-15436: Fixed a use after free vulnerability in fs/blockdev.c which could have allowed local users to gain privileges or cause a denial of service...

SUSE SLES15 Security Update : kernel (SUSE-SU-2020:3532-1)

The SUSE Linux Enterprise 15 LTSS kernel was updated to receive various security and bug fixes. The following security bugs were fixed : CVE-2020-25705: A flaw in the way reply ICMP packets are limited in was found that allowed to quickly scan open UDP ports. This flaw allowed an off-path remote...

SUSE SLES15 Security Update : kernel (SUSE-SU-2020:3513-1)

The SUSE Linux Enterprise 15 SP1 RT kernel was updated to receive various security and bug fixes. The following security bugs were fixed : CVE-2020-25705: A flaw in the way reply ICMP packets are limited in was found that allowed to quickly scan open UDP ports. This flaw allowed an off-path remot...

SUSE-SU-2020:3690-1 Security update for the Linux Kernel (Live Patch 18 for SLE 15 SP1)

This update for the Linux Kernel 4.12.14-19767 fixes several issues. The following security issues were fixed: - CVE-2020-25668: Fixed a concurrency use-after-free in confontop bsc1178622. - CVE-2020-25705: Fixed a flaw which could have allowed an off-path remote user to effectively bypass source...

SUSE-SU-2020:3651-1 Security update for the Linux Kernel (Live Patch 35 for SLE 12 SP3)

This update for the Linux Kernel 4.4.180-94130 fixes several issues. The following security issues were fixed: - CVE-2020-25668: Fixed a concurrency use-after-free in confontop bsc1178622. - CVE-2020-8694: Fixed an insufficient access control in the Linux kernel driver for some IntelR Processors...

Source Port UDP Randomization Bypass

A flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentialit...

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Based Products (RUGGEDCOM RM1224: All versions between v5.0 and v6.4 SCALANCE M-800: All versions between v5.0 and v6.4 SCALANCE S615: All versions between v5.0 and v6.4 SCALANCE SC-600: All versions prior to v2.1.3 SCALANCE W1750D: v8.3.0.1 v8.6.0 and v8.7.0 SIMATIC Cloud Connect 7: All versions SIMATIC MV500 Family: All versions SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later SIMATIC NET CP 1243-7 LTE EU: Version

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The vulnerability of the Linux operating system’s kernel allows a hacker to gain unauthorized access to protected information.

The vulnerability of Linux operating system kernels is related to ICMP packet inspection errors. Exploiting this vulnerability can allow a remote attacker to gain unauthorized access to protected information by bypassing the UDP port randomization mechanism...

SUSE-SU-2020:3532-1 Security update for the Linux Kernel

The SUSE Linux Enterprise 15 LTSS kernel was updated to receive various security and bug fixes. The following security bugs were fixed: - CVE-2020-25705: A flaw in the way reply ICMP packets are limited in was found that allowed to quickly scan open UDP ports. This flaw allowed an off-path remote...

CVE-2020-25705

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Bas...

DEBIAN-CVE-2020-25705

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Bas...

CVE-2020-25705

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Bas...

CVE-2020-25705

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Bas...

UBUNTU-CVE-2020-25705

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Bas...

CVE-2020-25705

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Bas...

CVE-2020-24434

Acrobat Reader DC versions 2020.012.20048 and earlier, 2020.001.30005 and earlier and 2017.011.30175 and earlier are affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to bypass mitigations such as ASLR...

CVE-2020-24427

Acrobat Reader versions 2020.012.20048 and earlier, 2020.001.30005 and earlier and 2017.011.30175 and earlier are affected by an input validation vulnerability when decoding a crafted codec that could result in the disclosure of sensitive memory. An attacker could leverage this vulnerability to...

CVE-2020-24426

Acrobat Reader DC versions 2020.012.20048 and earlier, 2020.001.30005 and earlier and 2017.011.30175 and earlier are affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to bypass mitigations such as ASLR...

CVE-2020-24426

Acrobat Reader DC versions 2020.012.20048 and earlier, 2020.001.30005 and earlier and 2017.011.30175 and earlier are affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to bypass mitigations such as ASLR...