exploit the possibilities

Ubuntu Security Notice USN-4738-1

Ubuntu Security Notice USN-4738-1
Posted Feb 18, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4738-1 - Paul Kehrer discovered that OpenSSL incorrectly handled certain input lengths in EVP functions. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. Tavis Ormandy discovered that OpenSSL incorrectly handled parsing issuer fields. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2021-23840, CVE-2021-23841
MD5 | ddd35a00ee36d9b3807f0f94e460031e

Ubuntu Security Notice USN-4738-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4738-1
February 18, 2021

openssl, openssl1.0 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools
- openssl1.0: Secure Socket Layer (SSL) cryptographic library and tools

Details:

Paul Kehrer discovered that OpenSSL incorrectly handled certain input
lengths in EVP functions. A remote attacker could possibly use this issue
to cause OpenSSL to crash, resulting in a denial of service.
(CVE-2021-23840)

Tavis Ormandy discovered that OpenSSL incorrectly handled parsing issuer
fields. A remote attacker could possibly use this issue to cause OpenSSL to
crash, resulting in a denial of service. (CVE-2021-23841)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
libssl1.1 1.1.1f-1ubuntu4.2

Ubuntu 20.04 LTS:
libssl1.1 1.1.1f-1ubuntu2.2

Ubuntu 18.04 LTS:
libssl1.0.0 1.0.2n-1ubuntu5.6
libssl1.1 1.1.1-1ubuntu2.1~18.04.8

Ubuntu 16.04 LTS:
libssl1.0.0 1.0.2g-1ubuntu4.19

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://usn.ubuntu.com/4738-1
CVE-2021-23840, CVE-2021-23841

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu4.2
https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.2
https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1~18.04.8
https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.6
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.19
Login or Register to add favorites

File Archive:

February 2021

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Feb 1st
    33 Files
  • 2
    Feb 2nd
    30 Files
  • 3
    Feb 3rd
    15 Files
  • 4
    Feb 4th
    8 Files
  • 5
    Feb 5th
    11 Files
  • 6
    Feb 6th
    2 Files
  • 7
    Feb 7th
    1 Files
  • 8
    Feb 8th
    37 Files
  • 9
    Feb 9th
    15 Files
  • 10
    Feb 10th
    11 Files
  • 11
    Feb 11th
    26 Files
  • 12
    Feb 12th
    8 Files
  • 13
    Feb 13th
    1 Files
  • 14
    Feb 14th
    1 Files
  • 15
    Feb 15th
    9 Files
  • 16
    Feb 16th
    33 Files
  • 17
    Feb 17th
    6 Files
  • 18
    Feb 18th
    10 Files
  • 19
    Feb 19th
    20 Files
  • 20
    Feb 20th
    1 Files
  • 21
    Feb 21st
    1 Files
  • 22
    Feb 22nd
    17 Files
  • 23
    Feb 23rd
    15 Files
  • 24
    Feb 24th
    16 Files
  • 25
    Feb 25th
    0 Files
  • 26
    Feb 26th
    0 Files
  • 27
    Feb 27th
    0 Files
  • 28
    Feb 28th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close