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.

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

A buffer overflow flaw was found in the cyrus-imapd NNTP server, nntpd. A remote user able to use the nntpd service could use this flaw to crash the nntpd child process or, possibly, execute arbitrary code with the privileges of the cyrus user. (CVE-2011-3208)

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

This update of cyrus-imapd fixes a buffer overflow that could potentially be exploited by remote attackers to cause a crash or run arbitrary code (CVE-2011-3208).

The MITRE CVE database describes CVE-2011-3208 as :

A buffer overflow flaw was found in the cyrus-imapd NNTP server, nntpd. A remote user able to use the nntpd service could use this flaw to crash the nntpd child process or, possibly, execute arbitrary code with the privileges of the cyrus user.

The remote Oracle Linux 5 / 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2011-1317 advisory.

    [2.3.16-6.3]
    - Resolves: #735391 - CVE-2011-3208 nntpd buffer overflow

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

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

This update of cyrus-imapd fixes a buffer overflow that could potentially be exploited by remote attackers to cause a crash or run arbitrary code. (CVE-2011-3208)

This update of cyrus-imapd fixes a buffer overflow that could have been potentially exploited by remote attackers to cause a crash or run arbitrary code. (CVE-2011-3208)

The remote host is affected by the vulnerability described in GLSA-201110-16 (Cyrus IMAP Server: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in the Cyrus IMAP Server.
      Please review the CVE identifiers referenced below for details.
  Impact :

    An unauthenticated local or remote attacker may be able to execute       arbitrary code with the privileges of the Cyrus IMAP Server process or       cause a Denial of Service.
  Workaround :

    There is no known workaround at this time.

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:
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The updated packages have been patched to correct these issues.

- security fix :

    - fixes incomplete authentication checks in nntpd       (Secunia SA46093)

    - other fixed bugs :

    - delayed delete can fail because of invalid names

    - cyradm cannot wildcard delete ACLs from a mailbox

    - Wrong ENABLE result (doubled names)

    - mbpath output changed from 2.3 to 2.4 for remote       mailboxes

    - xfer fails on unlimited quota (-1)

CVE-2011-3208 cyrus-imapd: nntpd buffer overflow in split_wildmats()

Bugs Fixed :

3495 P1 enhancement 2.4.10 Cyrus IMAP Improved duplicate suppression 3498 P1 bug 2.4.10 Cyrus IMAP quota command deletes users quota files 2772 P2 bug 2.4.x (next) Cyrus IMAP cmd_thread cores with bogus ids in references header 3300 P3 bug 2.4.2 Cyrus IMAP SOL_TCP is not defined on NetBSD 3439 P3 bug 2.3.16 Cyrus IMAP formatting issue on logging (or memory corruption ?) 3454 P3 bug 2.4.8 Cyrus IMAP ID with unquoted id_param_list keys not accepted 3463 P3 bug 2.4.x (next) Cyrus IMAP Certain mails will crash imapd if using server side threading 3489 P3 bug 2.4.10 Cyrus IMAP 2.4.10 and quota problem 3491 P3 enhancement 2.4.10 Cyrus IMAP UNAUTHENTICATE and NOOP in timsieved 3492 P3 bug 2.4.10 Cyrus IMAP Add response codes to timsieved 3497 P3 bug 2.4.10 Cyrus IMAP In master/master.c:add_service the variable 'cmd' is set to NULL before syslogging 3503 P3 bug 2.4.10 Cyrus IMAP DragonFly BSD also require PIC objects for perl 3505 P3 bug 2.4.x (next) Cyrus IMAP sync_reset is broken 3506 P3 bug 2.4.x (next) Cyrus IMAP dlist.c uses synchronizing IMAP LITERALS without backchannel. 3507 P3 bug 2.4.x (next) Cyrus IMAP Replication reconciliation fails in default/immediate expunge mode 3526 P3 bug 2.4.10 Cyrus IMAP AFS ptloader reinitialization uses local cell instead of afspts_mycell config option 3532 P3 enhancement 2.5.x (next) Cyrus IMAP Fix file descriptor cleanup 3279 P5 bug 2.4.2 Cyrus IMAP sync_client crashes with empty mech_list before TLS starts 3451 P5 enhancement 2.4.8 Cyrus IMAP config2header assume CC has no spaces

  - rebuild to match db library update

    - do not conflict with db4-utils

    - rebuild to match db library update CVE-2011-3208       cyrus-imapd: nntpd buffer overflow in split_wildmats()

Bugs Fixed :

3495 P1 enhancement 2.4.10 Cyrus IMAP Improved duplicate suppression 3498 P1 bug 2.4.10 Cyrus IMAP quota command deletes users quota files 2772 P2 bug 2.4.x (next) Cyrus IMAP cmd_thread cores with bogus ids in references header 3300 P3 bug 2.4.2 Cyrus IMAP SOL_TCP is not defined on NetBSD 3439 P3 bug 2.3.16 Cyrus IMAP formatting issue on logging (or memory corruption ?) 3454 P3 bug 2.4.8 Cyrus IMAP ID with unquoted id_param_list keys not accepted 3463 P3 bug 2.4.x (next) Cyrus IMAP Certain mails will crash imapd if using server side threading 3489 P3 bug 2.4.10 Cyrus IMAP 2.4.10 and quota problem 3491 P3 enhancement 2.4.10 Cyrus IMAP UNAUTHENTICATE and NOOP in timsieved 3492 P3 bug 2.4.10 Cyrus IMAP Add response codes to timsieved 3497 P3 bug 2.4.10 Cyrus IMAP In master/master.c:add_service the variable 'cmd' is set to NULL before syslogging 3503 P3 bug 2.4.10 Cyrus IMAP DragonFly BSD also require PIC objects for perl 3505 P3 bug 2.4.x (next) Cyrus IMAP sync_reset is broken 3506 P3 bug 2.4.x (next) Cyrus IMAP dlist.c uses synchronizing IMAP LITERALS without backchannel. 3507 P3 bug 2.4.x (next) Cyrus IMAP Replication reconciliation fails in default/immediate expunge mode 3526 P3 bug 2.4.10 Cyrus IMAP AFS ptloader reinitialization uses local cell instead of afspts_mycell config option 3532 P3 enhancement 2.5.x (next) Cyrus IMAP Fix file descriptor cleanup 3279 P5 bug 2.4.2 Cyrus IMAP sync_client crashes with empty mech_list before TLS starts 3451 P5 enhancement 2.4.8 Cyrus IMAP config2header assume CC has no spaces

  - rebuild to match db library update

    - do not conflict with db4-utils

    - rebuild to match db library update

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional 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.

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

The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

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

A buffer overflow flaw was found in the cyrus-imapd NNTP server, nntpd. A remote user able to use the nntpd service could use this flaw to crash the nntpd child process or, possibly, execute arbitrary code with the privileges of the cyrus user. (CVE-2011-3208)

Red Hat would like to thank Greg Banks for reporting this issue.

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

The remote Redhat Enterprise Linux 4 / 5 / 6 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2011:1317 advisory.

  - cyrus-imapd: nntpd buffer overflow in split_wildmats() (CVE-2011-3208)

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

ID	Name	Product	Family	Severity
78263	Amazon Linux AMI : cyrus-imapd (ALAS-2011-2)	Nessus	Amazon Linux Local Security Checks	high
75810	openSUSE Security Update : cyrus-imapd (openSUSE-SU-2011:1036-1)	Nessus	SuSE Local Security Checks	high
75458	openSUSE Security Update : cyrus-imapd (openSUSE-SU-2011:1036-1)	Nessus	SuSE Local Security Checks	high
69561	Amazon Linux AMI : cyrus-impad (ALAS-2011-02)	Nessus	Amazon Linux Local Security Checks	high
68352	Oracle Linux 5 / 6 : cyrus-imapd (ELSA-2011-1317)	Nessus	Oracle Linux Local Security Checks	critical
61136	Scientific Linux Security Update : cyrus-imapd on SL4.x, SL5.x, SL6.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	high
57175	SuSE 10 Security Update : cyrus-imapd (ZYPP Patch Number 7727)	Nessus	SuSE Local Security Checks	high
57095	SuSE 11.1 Security Update : cyrus-imapd (SAT Patch Number 5096)	Nessus	SuSE Local Security Checks	high
56604	SuSE 10 Security Update : cyrus-imapd (ZYPP Patch Number 7728)	Nessus	SuSE Local Security Checks	high
56591	GLSA-201110-16 : Cyrus IMAP Server: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
56525	Mandriva Linux Security Advisory : cyrus-imapd (MDVSA-2011:149)	Nessus	Mandriva Local Security Checks	high
56519	Fedora 16 : cyrus-imapd-2.4.12-1.fc16 (2011-13832)	Nessus	Fedora Local Security Checks	high
56486	Fedora 15 : cyrus-imapd-2.4.12-1.fc15 (2011-13860)	Nessus	Fedora Local Security Checks	high
56409	Debian DSA-2318-1 : cyrus-imapd-2.2 - multiple vulnerabilities	Nessus	Debian Local Security Checks	high
56247	CentOS 4 / 5 : cyrus-imapd (CESA-2011:1317)	Nessus	CentOS Local Security Checks	high
56235	RHEL 4 / 5 / 6 : cyrus-imapd (RHSA-2011:1317)	Nessus	Red Hat Local Security Checks	critical

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