• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

Europol shuts down Archetyp Market, longest-running dark web drug marketplace

 | 

Kelly Benefits data breach has impacted 550,000 people, and the situation continues to worsen as the investigation progresses

 | 

Cisco removed the backdoor account from its Unified Communications Manager

 | 

U.S. Sanctions Russia's Aeza Group for aiding crooks with bulletproof hosting

 | 

Qantas confirms customer data breach amid Scattered Spider attacks

 | 

CVE-2025-6554 is the fourth Chrome zero-day patched by Google in 2025

 | 

U.S. CISA adds TeleMessage TM SGNL flaws to its Known Exploited Vulnerabilities catalog

 | 

A sophisticated cyberattack hit the International Criminal Court

 | 

Esse Health data breach impacted 263,000 individuals

 | 

Europol dismantles €460M crypto scam targeting 5,000 victims worldwide

 | 

CISA and U.S. Agencies warn of ongoing Iranian cyber threats to critical infrastructure

 | 

U.S. CISA adds Citrix NetScaler flaw to its Known Exploited Vulnerabilities catalog

 | 

Canada bans Hikvision over national security concerns

 | 

Denmark moves to protect personal identity from deepfakes with new copyright law

 | 

Ahold Delhaize data breach affected over 2.2 Million individuals

 | 

Facebook wants access to your camera roll for AI photo edits

 | 

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 51

 | 

Security Affairs newsletter Round 530 by Pierluigi Paganini – INTERNATIONAL EDITION

 | 

The FBI warns that Scattered Spider is now targeting the airline sector

 | 

LapDogs: China-nexus hackers Hijack 1,000+ SOHO devices for espionage

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • Breaking News
  • Hacking
  • Security
  • A High-Severity flaw in OpenSSL allows the HTTPS Traffic decryption

A High-Severity flaw in OpenSSL allows the HTTPS Traffic decryption

Pierluigi Paganini May 05, 2016

OpenSSL has the patches for six flaws including two high-severity bugs that could allow attackers to decrypt HTTPS traffic and execute malicious code on the server.

OpenSSL just released several patches to fix vulnerabilities in the open-source cryptographic library, including a couple of high-severity flaws (CVE-2016-2107, CVE-2016-2108) that could be exploited to decrypt HTTPS Traffic.

The CVE-2016-2107 could be exploited by hackers to launch a man-in-the-middle attack leveraging on the ‘Padding Oracle Attack’ that can decrypt HTTPS traffic if the connection uses AES-CBC cipher and the server supports AES-NI.

OpenSSL 2

The Padding Oracle decryption flaw allows an attacker to repeatedly probe an encrypted payload in the attempt to retrieve the plaintext. The flaw was first spotted by Juraj Somorovsky that released also a tool called TLS-Attacker to exploit it.

According to the experts, the flaw affects the OpenSSL  cryptographic library since 2013, when maintainers of the project fixed another Padding Oracle flaw called Lucky 13.

“A MITM attacker can use a padding oracle attack to decrypt traffic when the connection uses an AES CBC cipher and the server support AES-NI.” states the advisory issued by the OpenSSL. “This issue was introduced as part of the fix for Lucky 13 padding attack (CVE-2013-0169). The padding check was rewritten to be in constant time by making sure that always the same  bytes are read and compared against either the MAC or padding bytes. But it no longer checked that there was enough data to have both the MAC and padding bytes.”

The second flaw (CVE-2016-2108), ranked as a high-severity issue, is a buffer overflow vulnerability in the OpenSSL that only affects OpenSSL versions prior to April 2015.

The ASN.1 encoding the value zero represented as a negative integer can cause a buffer underflow resulting in memory corruption due to the writing out-of-bounds in the i2c_ASN1_INTEGER. An attacker can exploit the vulnerability to execute malicious code on the web server.

“This issue affected versions of OpenSSL prior to April 2015. The bug causing the vulnerability was fixed on April 18th 2015, and released as part of the June 11th 2015 security releases. The security impact of the bug was not known at the time. In previous versions of OpenSSL, ASN.1 encoding the value zero represented as a negative integer can cause a buffer underflow with an out-of-bounds write in i2c_ASN1_INTEGER. The ASN.1 parser does not normally create “negative zeroes” when parsing ASN.1 input, and therefore, an attacker cannot trigger this bug.” states the advisory.

If an application deserializes untrusted ASN.1 structures containing an ANY field, and later reserializes them, an attacker may be able to trigger the flaw causing the out-of-bounds write. The flaw can be triggered, for example, by using maliciously-crafted digital certificates signed by trusted certificate authorities.

“Applications that parse and re-encode X509 certificates are known to be vulnerable. Applications that verify RSA signatures on X509 certificates may also be vulnerable; however, only certificates with valid signatures trigger ASN.1 re-encoding and hence the bug. “

OpenSSL also fixed other four low-severity vulnerabilities, a memory exhaustion issue, a bug that resulted in arbitrary stack data being returned in the buffer and two overflow vulnerabilities.

Administrators using OpenSSL versions 1.0.1 and 1.0.2 need to install the security updates as soon as possible.

[adrotate banner=”9″]

Pierluigi Paganini

(Security Affairs – OpenSSL, encryption)


facebook linkedin twitter

encryption Hacking man-in-the-middle OpenSSL Padding Oracle security TLS

you might also like

Pierluigi Paganini July 03, 2025
Europol shuts down Archetyp Market, longest-running dark web drug marketplace
Read more
Pierluigi Paganini July 03, 2025
Kelly Benefits data breach has impacted 550,000 people, and the situation continues to worsen as the investigation progresses
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    Europol shuts down Archetyp Market, longest-running dark web drug marketplace

    Cyber Crime / July 03, 2025

    Kelly Benefits data breach has impacted 550,000 people, and the situation continues to worsen as the investigation progresses

    Uncategorized / July 03, 2025

    Cisco removed the backdoor account from its Unified Communications Manager

    Security / July 02, 2025

    U.S. Sanctions Russia's Aeza Group for aiding crooks with bulletproof hosting

    Cyber Crime / July 02, 2025

    Qantas confirms customer data breach amid Scattered Spider attacks

    Cyber Crime / July 02, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT