Why Did the OpenSSL Punycode Vulnerability Happen

Some room-temperature takes on yesterdays not-quite-RCE vulnerabilities in OpenSSL 3.0, and on what there is to learn about safe cryptography engineering. A recap Yesterday OpenSSL published version 3.0.7, which was pre-announced to contain a fix for a CRITICAL vulnerability, the first one since...

OpenSSL Releases Patch for 2 New High-Severity Vulnerabilities

The OpenSSL project has rolled out fixes to contain two high-severity flaws in its widely used cryptography library that could result in a denial-of-service DoS and remote code execution. The issues, tracked as CVE-2022-3602 and CVE-2022-3786, have been described as buffer overrun vulnerabilities...

OpenSSL 3.0.0 to 3.0.6 decodes some punycode email addresses in X.509 certificates improperly

Overview Two buffer overflow vulnerabilities were discovered in OpenSSL versions 3.0.0 through 3.0.6. These vulnerabilities were introduced in version 3.0.0 with the inclusion of support for punycode email address parsing for X.509 certificates. OpenSSL's assessment of the severity of the...

Homograph Attacks

roundcube is vulnerable to homograph attacks. The vulnerability exists due to the way the system mishandles Punycode xn-- domain names which allows an attacker to cause a homograph attack...

CVE-2019-9636

It was discovered that python's functions urllib.parse.urlsplit and urllib.parse.urlparse do not properly handle URLs encoded with Punycode/Internationalizing Domain Names in Applications IDNA, which may result in a wrong domain name specifically the netloc component of URL - user@domain:port bei...

Mail.ru: Account takeover in cups.mail.ru using punycode characters

A logical bug in database collation usage for string comparison during access recovery process allowed to takover account in cups.mail.ru by registering colliding Unicode domain...

CVE-2020-12474

Telegram Desktop through 2.0.1, Telegram through 6.0.1 for Android, and Telegram through 6.0.1 for iOS allow an IDN Homograph attack via Punycode in a public URL or a group chat invitation URL...

DEBIAN-CVE-2020-12474

Telegram Desktop through 2.0.1, Telegram through 6.0.1 for Android, and Telegram through 6.0.1 for iOS allow an IDN Homograph attack via Punycode in a public URL or a group chat invitation URL...

CVE-2020-12474

Telegram Desktop through 2.0.1, Telegram through 6.0.1 for Android, and Telegram through 6.0.1 for iOS allow an IDN Homograph attack via Punycode in a public URL or a group chat invitation URL...

UBUNTU-CVE-2020-12474

Telegram Desktop through 2.0.1, Telegram through 6.0.1 for Android, and Telegram through 6.0.1 for iOS allow an IDN Homograph attack via Punycode in a public URL or a group chat invitation URL...

Design/Logic Flaw

Telegram Desktop through 2.0.1, Telegram through 6.0.1 for Android, and Telegram through 6.0.1 for iOS allow an IDN Homograph attack via Punycode in a public URL or a group chat invitation URL...

CVE-2020-12474

CVE-2020-12474 affects Telegram products: Desktop up to 2.0.1, Android up to 6.0.1, and iOS up to 6.0.1. The vulnerability is an IDN Homograph attack triggered by a Punycode-encoded URL in public links or group chat invitations. Connected documents corroborate this description (no public details ...

CVE-2020-12474

Telegram Desktop through 2.0.1, Telegram through 6.0.1 for Android, and Telegram through 6.0.1 for iOS allow an IDN Homograph attack via Punycode in a public URL or a group chat invitation URL...

Updated roundcubemail packages fix security vulnerability

The updated package fixes a security vulnerability: Roundcube Webmail through 1.3.9 mishandles Punycode xn-- domain names, leading to homograph attacks. CVE-2019-15237...

MGASA-2019-0420 Updated roundcubemail packages fix security vulnerability

The updated package fixes a security vulnerability: Roundcube Webmail through 1.3.9 mishandles Punycode xn-- domain names, leading to homograph attacks. CVE-2019-15237...

Fedora 30 : mingw-libidn2 (2019-d3221d69e0)

Libidn 2.2.0 released 2019-05-23 ================================== - Perform A-Label roundtrip for lookup functions by default - Stricter check of input to punycode decoder - Fix punycode decoding with no ASCII chars but given delimiter - Fix idn2 --no-tr64 was a no-op - Allow as a basic code...

Fedora 29 : mingw-libidn2 (2019-a8d35fcf7c)

Libidn 2.2.0 released 2019-05-23 ================================== - Perform A-Label roundtrip for lookup functions by default - Stricter check of input to punycode decoder - Fix punycode decoding with no ASCII chars but given delimiter - Fix idn2 --no-tr64 was a no-op - Allow as a basic code...

ALPINE-CVE-2019-12290

GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the...

DEBIAN-CVE-2019-12290

GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the...

UBUNTU-CVE-2019-12290

GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the...