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Linux Kernel Leftovers

Submitted by Roy Schestowitz on Saturday 13th of March 2021 01:15:35 AM Filed under
Linux
»

Microsoft boosters shifting attention to Linux?

Submitted by Roy Schestowitz on Saturday 13th of March 2021 09:35:03 PM.

More Microsoft boosters

Submitted by Roy Schestowitz on Sunday 14th of March 2021 10:17:08 PM.

These Linux vulnerabilities have existed for YEARS

Submitted by Roy Schestowitz on Monday 15th of March 2021 02:35:31 PM.

Decade-old Linux kernel bugs are putting devices at risk

Submitted by Roy Schestowitz on Monday 15th of March 2021 02:45:30 PM.
  • Decade-old Linux kernel bugs are putting devices at risk

    Cybersecurity company GRIMM found the vulnerabilities lurking in the kernel’s iSCSI (Small Computer System Interface) subsystem that can be exploited to gain root privileges on Linux machines.

    [...]

    Nichols believes the bugs were introduced during the early development of the iSCSI module over a decade and half ago. The module helped access shared data storage facilities.

    As Nichols notes, while SCSI is still in use today its use isn’t as prevalent as it was back in the day. This is why the vulnerable module isn’t loaded by default on most desktop distros. Another saving grace of sorts is that the bugs exist in a piece of code that isn’t remotely accessible, which means the attackers need physical access to the device to exploit them.

    However, this still makes them potentially dangerous because of how the kernel handles modules. “The Linux kernel loads modules either because new hardware is detected or because a kernel function detects that a module is missing. The latter implicit autoload case is more likely to be abused and is easily triggered by an attacker, enabling them to increase the attack surface of the kernel,” reasons Nichols.

    Patches for all three vulnerabilities have been added to the mainline kernel last week, and have also been backported to other Long Term Support (LTS) kernel branches currently supported.

Decade-old Linux kernel vulnerabilities...

Submitted by Roy Schestowitz on Monday 15th of March 2021 04:30:00 PM.
  • Decade-old Linux kernel vulnerabilities are threatening device security

    Researchers have identified three major vulnerabilities in the Linux kernel that have existed for more than a decade.

    According to cybersecurity firm GRIMM, these bugs could allow attackers to elevate their privileges from basic to root, opening the door to data theft, malware and ransomware distribution, escalation of privilege and DDoS attacks, Bleeping Computer reported.

    The vulnerabilities (CVE-2021-27365, CVE-2021-27363 and CVE-2021-27364) have since been fixed and patches for the mainline Linux kernel became generally available on March 7. Linux users have been urged to patch their systems immediately.

    Despite their relative severity, the vulnerabilities aren't particularly easy to exploit, requiring local access to the target device. This means attackers would either need to access the device physically or chain the Linux bugs with other vulnerabilities.

Another late one

Submitted by Roy Schestowitz on Wednesday 17th of March 2021 02:09:38 AM.

"Linux vulnerabilities"

Submitted by Roy Schestowitz on Wednesday 17th of March 2021 03:10:22 AM.
  • ProxyLogon updates. Operation Diànxùn targets telecoms. Linux vulnerabilities. Malware operator plays innocent.

    Researchers at GRIMM have discovered three vulnerabilities in the Linux kernel, including a Local Privilege Escalation affecting several Linux environments. Patches for the flaws were released on March 7th. The researchers explain, "Due to the non-deterministic nature of heap overflows, the first vulnerability could be used as an unreliable, local DoS. However, when combined with an information leak, this vulnerability can be further exploited as a LPE that allows an attacker to escalate from an unprivileged user account to root. A separate information leak is not necessary, though, since this vulnerability can be used to leak kernel memory as well. The second vulnerability (kernel pointer leak) is less impactful and could only serve as a potential information leak. Similarly, the third vulnerability (out-of-bounds read) is also limited to functioning as a potential information leak or even an unreliable local DoS."

The Linux Kernel Had 3 Potential Root Access Vulnerabilities

Submitted by Roy Schestowitz on Wednesday 17th of March 2021 03:44:39 AM.
  • The Linux Kernel Had 3 Potential Root Access Vulnerabilities For 15 Years

    Linux kernels prior to 5.11.4, 5.10.21, 5.4.103, 4.19.179, 4.14.224, 4.9.260 and 4.4.260 have three 15 year old vulnerabilities in the iSCSI subsystem that could potentially allow a hostile local user to gain root privileges. Most GNU/Linux distributions compile their kernels with ISCSI_TARGET=y so this affects all of them.

    [...]

    GRIMM has developed a proof-of-concept Local Privilege Escalation (LPE) exploit using one of the tree vulnerabilities known as CVE-2021-27363, CVE-2021-27364 CVE-2021-27364 and CVE-2021-27365. It works, given the right circumstances, but that does not mean most people running Linux need to panic and upgrade within the next few minutes.

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