imap/nntpd.c in the NNTP server (nntpd) for Cyrus IMAPd 2.4.x before 2.4.12 allows remote attackers to bypass authentication by sending an AUTHINFO USER command without sending an additional AUTHINFO PASS command.

An authentication bypass (CVE-2011-3372) and a DoS vulnerability (CVE-2011-3481) have been fixed in the Cyrus IMAPd nntpd.

An authentication bypass flaw was found in the cyrus-imapd NNTP server, nntpd. A remote user able to use the nntpd service could use this flaw to read or post newsgroup messages on an NNTP server configured to require user authentication, without providing valid authentication credentials. (CVE-2011-3372)

A NULL pointer dereference flaw was found in the cyrus-imapd IMAP server, imapd. A remote attacker could send a specially crafted mail message to a victim that would possibly prevent them from accessing their mail normally, if they were using an IMAP client that relies on the server threading IMAP feature. (CVE-2011-3481)

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2011-1508 advisory.

    - fix CVE-2011-3481: NULL pointer dereference via crafted       References header in email (#738391)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The cyrus-imapd packages contain a high-performance mail server with IMAP, POP3, NNTP, and Sieve support.

An authentication bypass flaw was found in the cyrus-imapd NNTP server, nntpd. A remote user able to use the nntpd service could use this flaw to read or post newsgroup messages on an NNTP server configured to require user authentication, without providing valid authentication credentials. (CVE-2011-3372)

A NULL pointer dereference flaw was found in the cyrus-imapd IMAP server, imapd. A remote attacker could send a specially crafted mail message to a victim that would possibly prevent them from accessing their mail normally, if they were using an IMAP client that relies on the server threading IMAP feature. (CVE-2011-3481)

Users of cyrus-imapd are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the update, cyrus-imapd will be restarted automatically.

The remote NNTP server contains a logic error that causes clients that send only a username, neglecting to send a password, to be treated as authenticated.  This may permit an unauthenticated, remote attacker to view and post to restricted newsgroups, impersonating other users in the process.

Updated cyrus-imapd packages that fix two security issues are now available for Red Hat Enterprise Linux 4, 5, and 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The cyrus-imapd packages contain a high-performance mail server with IMAP, POP3, NNTP, and Sieve support.

An authentication bypass flaw was found in the cyrus-imapd NNTP server, nntpd. A remote user able to use the nntpd service could use this flaw to read or post newsgroup messages on an NNTP server configured to require user authentication, without providing valid authentication credentials. (CVE-2011-3372)

A NULL pointer dereference flaw was found in the cyrus-imapd IMAP server, imapd. A remote attacker could send a specially crafted mail message to a victim that would possibly prevent them from accessing their mail normally, if they were using an IMAP client that relies on the server threading IMAP feature. (CVE-2011-3481)

Red Hat would like to thank the Cyrus IMAP project for reporting the CVE-2011-3372 issue. Upstream acknowledges Stefan Cornelius of Secunia Research as the original reporter of CVE-2011-3372.

Users of cyrus-imapd are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the update, cyrus-imapd will be restarted automatically.

Multiple vulnerabilities has been discovered and corrected in cyrus-imapd :

Stack-based buffer overflow in the split_wildmats function in nntpd.c in nntpd in Cyrus IMAP Server before 2.3.17 and 2.4.x before 2.4.11 allows remote attackers to execute arbitrary code via a crafted NNTP command (CVE-2011-3208).

Secunia Research has discovered a vulnerability in Cyrus IMAPd, which can be exploited by malicious people to bypass certain security restrictions. The vulnerability is caused due to an error within the authentication mechanism of the NNTP server, which can be exploited to bypass the authentication process and execute commands intended for authenticated users by sending an AUTHINFO USER command without a following AUTHINFO PASS command (CVE-2011-3372).

Packages for 2009.0 are provided as of the Extended Maintenance Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149 products_id=490

The updated packages have been patched to correct these issues.

Multiple security issues have been discovered in cyrus-imapd, a highly scalable mail system designed for use in enterprise environments. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2011-3208     Coverity discovered a stack-based buffer overflow in the     NNTP server implementation (nttpd) of cyrus-imapd. An     attacker can exploit this flaw via several crafted NNTP     commands to execute arbitrary code.

  - CVE-2011-3372     Stefan Cornelius of Secunia Research discovered that the     command processing of the NNTP server implementation     (nttpd) of cyrus-imapd is not properly implementing     access restrictions for certain commands and is not     checking for a complete, successful authentication. An     attacker can use this flaw to bypass access restrictions     for some commands and, e.g. exploit CVE-2011-3208     without proper authentication.

ID	Name	Product	Family	Severity
75811	openSUSE Security Update : cyrus-imapd (openSUSE-SU-2011:1170-1)	Nessus	SuSE Local Security Checks	high
75459	openSUSE Security Update : cyrus-imapd (openSUSE-SU-2011:1170-1)	Nessus	SuSE Local Security Checks	high
69586	Amazon Linux AMI : cyrus-imapd (ALAS-2011-27)	Nessus	Amazon Linux Local Security Checks	high
68397	Oracle Linux 5 / 6 : cyrus-imapd (ELSA-2011-1508)	Nessus	Oracle Linux Local Security Checks	high
61182	Scientific Linux Security Update : cyrus-imapd on SL4.x, SL5.x, SL6.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	high
57336	Cyrus IMAPd NNTP AUTHINFO USER Command Parsing Authentication Bypass	Nessus	General	medium
57176	SuSE 10 Security Update : cyrus-imapd (ZYPP Patch Number 7785)	Nessus	SuSE Local Security Checks	high
57096	SuSE 11.1 Security Update : cyrus-imapd (SAT Patch Number 5233)	Nessus	SuSE Local Security Checks	high
56991	RHEL 4 / 5 / 6 : cyrus-imapd (RHSA-2011:1508)	Nessus	Red Hat Local Security Checks	high
56985	CentOS 4 / 5 : cyrus-imapd (CESA-2011:1508)	Nessus	CentOS Local Security Checks	high
56605	SuSE 10 Security Update : cyrus-imapd (ZYPP Patch Number 7786)	Nessus	SuSE Local Security Checks	high
56525	Mandriva Linux Security Advisory : cyrus-imapd (MDVSA-2011:149)	Nessus	Mandriva Local Security Checks	high
56409	Debian DSA-2318-1 : cyrus-imapd-2.2 - multiple vulnerabilities	Nessus	Debian Local Security Checks	high

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