ruby: StartTLS stripping vulnerability in Net::IMAP

Ruby's Net::IMAP module did not raise an exception when receiving an unexpected response to the STARTTLS command and the connection was not upgraded to use TLS. A man-in-the-middle attacker could use this flaw to prevent Ruby applications using Net::IMAP to enable TLS encryption for a connection ...

Slackware Linux 14.0 / 14.1 / 14.2 / current curl Multiple Vulnerabilities (SSA:2021-258-01)

The version of curl installed on the remote host is prior to 7.79.0. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2021-258-01 advisory. - When curl = 7.20.0 and = 7.20.0 and = 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP...

Amazon Linux 2 : thunderbird (ALAS-2021-1709)

The version of thunderbird installed on the remote host is prior to 78.13.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1709 advisory. If Thunderbird was configured to use STARTTLS for an IMAP connection, and an attacker injected IMAP server responses...

Information Disclosure

Fetchmail is vulnerable to informaiton disclosure. It fails to enforce STARTTLS session encryption in some circumstances, such as a certain situation with IMAP and PREAUTH...

CURL-CVE-2021-22947 STARTTLS protocol injection via MITM

When curl connects to an IMAP, POP3, SMTP or FTP server to exchange data securely using STARTTLS to upgrade the connection to TLS level, the server can still respond and send back multiple responses before the TLS upgrade. Such multiple pipelined responses are cached by curl. curl would then...

Protocol downgrade required TLS bypassed

A user can tell curl to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server --ssl-reqd on the command line or CURLOPTUSESSL set to CURLUSESSLCONTROL or CURLUSESSLALL with libcurl. This requirement could be bypassed if the server would return a properly crafted but...

CVE-2021-22947

A flaw was found in curl. The flaw lies in how curl handles cached or pipelined responses that it receives from either a IMAP, POP3, SMTP or FTP server before the TLS upgrade using STARTTLS. In such a scenario curl even after upgrading to TLS would trust these cached responses treating them as...

CVE-2021-22946

A flaw was found in curl. This flaw lies in the --ssl-reqd option or related settings in libcurl. Users specify this flag to upgrade to TLS when communicating with either IMAP, POP3 or a FTP server. An attacker controlling such servers could return a crafted response which could lead to curl clie...

CVE-2021-22947

When curl = 7.20.0 and = 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instea...

Ubuntu 18.04 LTS / 20.04 LTS : curl vulnerabilities (USN-5079-1)

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5079-1 advisory. It was discovered that curl incorrect handled memory when sending data to an MQTT server. A remote attacker could use this issue to cause cur...

Important: Red Hat Security Advisory: cyrus-imapd security update

An update for cyrus-imapd is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability fr...

Important: cyrus-imapd security update

The Cyrus IMAP server provides access to personal mail, system-wide bulletin boards, news-feeds, calendar and contacts through the IMAP, JMAP, NNTP, CalDAV and CardDAV protocols. Security Fixes: cyrus-imapd: Denial of service via string hashing algorithm collisions CVE-2021-33582 For more details...

RLSA-2021:3492 Important: cyrus-imapd security update

The Cyrus IMAP server provides access to personal mail, system-wide bulletin boards, news-feeds, calendar and contacts through the IMAP, JMAP, NNTP, CalDAV and CardDAV protocols. Security Fixes: cyrus-imapd: Denial of service via string hashing algorithm collisions CVE-2021-33582 For more details...

Oracle Linux 8 : cyrus-imapd (ELSA-2021-3492)

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-3492 advisory. 3.0.7-20.1 - Fix for CVE-2021-33582 Tenable has extracted the preceding description block directly from the Oracle Linux security advisory. Note that Nessus has...

curl: CVE-2021-22946: Protocol downgrade required TLS bypassed

Summary: In imap and pop3, --ssl-reqd is silently ignored if the capability command failed. In ftp, a non-standard 230 response preauthentication? in the greeter message forces curl to continue unencrypted, even if TLS has been required. Steps To Reproduce: Use a parameterizable test server to fa...

ROS-2-2114

2.2114 Vulnerability in Mozilla Thunderbird email client CVE-2021-29970, CVE-2021-30547, CVE-2021-29976, CVE-2021-29969. 1. Vulnerability Description: CVE-2021-29970 Vulnerability in Mozilla Thunderbird email client, related to HTML content processing error. Exploitation of the vulnerability coul...

ROS-2-1717

2.1717 Vulnerability in Mozilla Thunderbird email client CVE-2021-29970, CVE-2021-30547, CVE-2021-29976, CVE-2021-29969. 1. Vulnerability Description: CVE-2021-29970 Vulnerability in Mozilla Thunderbird email client, related to HTML content processing error. Exploitation of the vulnerability coul...

ROS-2-2165

2.2165 Vulnerability in Mozilla Thunderbird email client CVE-2021-29970, CVE-2021-30547, CVE-2021-29976, CVE-2021-29969. 1. Vulnerability Description: CVE-2021-29970 Vulnerability in Mozilla Thunderbird email client, related to HTML content processing error. Exploitation of the vulnerability coul...

ROS-2-2178

2.2178 Vulnerability in Mozilla Thunderbird email client CVE-2021-29970, CVE-2021-30547, CVE-2021-29976, CVE-2021-29969. 1. Vulnerability Description: CVE-2021-29970 Vulnerability in Mozilla Thunderbird email client, related to HTML content processing error. Exploitation of the vulnerability coul...

ROS-2-2101

2.2101 Vulnerability in Mozilla Thunderbird email client CVE-2021-29970, CVE-2021-30547, CVE-2021-29976, CVE-2021-29969. 1. Vulnerability Description: CVE-2021-29970 Vulnerability in Mozilla Thunderbird email client, related to HTML content processing error. Exploitation of the vulnerability coul...