Daily Archives: November 21, 2022

Advisories

USN-5733-1: FLAC vulnerabilities

Read Time:30 Second

It was discovered that FLAC was not properly performing memory management
operations, which could result in a memory leak. An attacker could possibly
use this issue to cause FLAC to consume resources, leading to a denial of
service. (CVE-2017-6888)

It was discovered that FLAC was not properly performing bounds checking
operations when encoding or decoding data. If a user or automated system
were tricked into processing a specially crafted file, an attacker could
possibly use this issue to expose sensitive information or to cause FLAC
to crash, leading to a denial of service. (CVE-2020-0499, CVE-2021-0561)

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Advisories

heimdal-7.7.1-3.fc36

Read Time:41 Second

FEDORA-2022-dba9ba8e2b

Packages in this update:

heimdal-7.7.1-3.fc36

Update description:

Fixes:

Delay service starts until after network is online (rhbz#2005501)
Restart services on package update (will apply when updating from this release)

This release fixes the following Security Vulnerabilities:

CVE-2022-42898 PAC parse integer overflows
CVE-2022-3437 Overflows and non-constant time leaks in DES{,3} and arcfour
CVE-2022-41916 Fix Unicode normalization read of 1 bytes past end of array
CVE-2021-44758 NULL dereference DoS in SPNEGO acceptors
CVE-2021-3671 A null pointer de-reference when handling missing sname in TGS-REQ
CVE-2022-44640 Heimdal KDC: invalid free in ASN.1 codec

Note that CVE-2022-44640 is a severe vulnerability, possibly a 10.0 on the Common Vulnerability Scoring System (CVSS) v3.

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Advisories

heimdal-7.7.1-3.fc35

Read Time:41 Second

FEDORA-2022-cbbd105d08

Packages in this update:

heimdal-7.7.1-3.fc35

Update description:

Fixes:

Delay service starts until after network is online (rhbz#2005501)
Restart services on package update (will apply when updating from this release)

This release fixes the following Security Vulnerabilities:

CVE-2022-42898 PAC parse integer overflows
CVE-2022-3437 Overflows and non-constant time leaks in DES{,3} and arcfour
CVE-2022-41916 Fix Unicode normalization read of 1 bytes past end of array
CVE-2021-44758 NULL dereference DoS in SPNEGO acceptors
CVE-2021-3671 A null pointer de-reference when handling missing sname in TGS-REQ
CVE-2022-44640 Heimdal KDC: invalid free in ASN.1 codec

Note that CVE-2022-44640 is a severe vulnerability, possibly a 10.0 on the Common Vulnerability Scoring System (CVSS) v3.

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Advisories

heimdal-7.7.1-3.fc37

Read Time:41 Second

FEDORA-2022-2c77cee4b5

Packages in this update:

heimdal-7.7.1-3.fc37

Update description:

Fixes:

Delay service starts until after network is online (rhbz#2005501)
Restart services on package update (will apply when updating from this release)

This release fixes the following Security Vulnerabilities:

CVE-2022-42898 PAC parse integer overflows
CVE-2022-3437 Overflows and non-constant time leaks in DES{,3} and arcfour
CVE-2022-41916 Fix Unicode normalization read of 1 bytes past end of array
CVE-2021-44758 NULL dereference DoS in SPNEGO acceptors
CVE-2021-3671 A null pointer de-reference when handling missing sname in TGS-REQ
CVE-2022-44640 Heimdal KDC: invalid free in ASN.1 codec

Note that CVE-2022-44640 is a severe vulnerability, possibly a 10.0 on the Common Vulnerability Scoring System (CVSS) v3.

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Advisories

USN-5686-3: Git vulnerabilities

Read Time:21 Second

USN-5686-1 fixed vulnerabilities in Git. This update provides the corresponding
updates for Ubuntu 22.10.

Original advisory details:

Cory Snider discovered that Git incorrectly handled certain symbolic links.
An attacker could possibly use this issue to cause an unexpected behaviour.
(CVE-2022-39253)

Kevin Backhouse discovered that Git incorrectly handled certain command strings.
An attacker could possibly use this issue to arbitrary code execution.
(CVE-2022-39260)

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News

Breaking the Zeppelin Ransomware Encryption Scheme

Read Time:1 Minute, 6 Second

Brian Krebs writes about how the Zeppelin ransomware encryption scheme was broken:

The researchers said their break came when they understood that while Zeppelin used three different types of encryption keys to encrypt files, they could undo the whole scheme by factoring or computing just one of them: An ephemeral RSA-512 public key that is randomly generated on each machine it infects.

“If we can recover the RSA-512 Public Key from the registry, we can crack it and get the 256-bit AES Key that encrypts the files!” they wrote. “The challenge was that they delete the [public key] once the files are fully encrypted. Memory analysis gave us about a 5-minute window after files were encrypted to retrieve this public key.”

Unit 221B ultimately built a “Live CD” version of Linux that victims could run on infected systems to extract that RSA-512 key. From there, they would load the keys into a cluster of 800 CPUs donated by hosting giant Digital Ocean that would then start cracking them. The company also used that same donated infrastructure to help victims decrypt their data using the recovered keys.

A company offered recovery services based on this break, but was reluctant to advertise because it didn’t want Zeppelin’s creators to fix their encryption flaw.

Technical details.

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Advisories

CVE-2022-0421

Read Time:18 Second

The Five Star Restaurant Reservations WordPress plugin before 2.4.12 does not have authorisation when changing whether a payment was successful or failed, allowing unauthenticated users to change the payment status of arbitrary bookings. Furthermore, due to the lack of sanitisation and escaping, attackers could perform Cross-Site Scripting attacks against a logged in admin viewing the failed payments

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Advisories

CVE-2021-24649

Read Time:24 Second

The WP User Frontend WordPress plugin before 3.5.29 uses a user supplied argument called urhidden in its registration form, which contains the role for the account to be created with, encrypted via wpuf_encryption(). This could allow an attacker having access to the AUTH_KEY and AUTH_SALT constant (via an arbitrary file access issue for example, or if the blog is using the default keys) to create an account with any role they want, such as admin

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