CVE-2011-3208: Buffer Overflow
First published: Wed Aug 31 2011(Updated: )
A remotely exploitable buffer overflow flaw was found in Cyrus' nntpd. A malicious NNTP client would be able to exploit this to execute arbitrary code on a vulnerable nntpd server. If the 'allowanonymouslogin' option was set in imapd.conf, it could be done without authentication. When compiled with FORTIFY_SOURCE (the default on Red Hat Enterprise Linux 5 and 6, as well as Fedora), this flaw is not exploitable and will result in a crash of the nntpd service. The following patch will correct the flaw: diff --git a/imap/nntpd.c b/imap/nntpd.c index 56405d3..6b30174 100644 --- a/imap/nntpd.c +++ b/imap/nntpd.c @@ -4131,7 +4131,8 @@ static struct wildmat *split_wildmats(char *str) else if (*c == '@') wild[n].not = -1; /* absolute not (feeding) */ else wild[n].not = 0; - strcpy(p, wild[n].not ? c + 1 : c); + strncpy(p, wild[n].not ? c + 1 : c, pattern+sizeof(pattern) - p); + pattern[sizeof(pattern)-1] = '\0'; wild[n++].pat = xstrdup(pattern); } while (c != str); wild[n].pat = NULL;
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/cyrus-imapd | <0:2.2.12-16.el4 | 0:2.2.12-16.el4 |
| redhat/cyrus-imapd | <0:2.3.7-12.el5_7.1 | 0:2.3.7-12.el5_7.1 |
| redhat/cyrus-imapd | <0:2.3.16-6.el6_1.3 | 0:2.3.16-6.el6_1.3 |
| redhat/cyrus-imapd | <2.4.11 | 2.4.11 |
| Cyrus IMAP Server | <=2.3.16 | |
| Cyrus IMAP Server | =2.0.17 | |
| Cyrus IMAP Server | =2.1.16 | |
| Cyrus IMAP Server | =2.1.17 | |
| Cyrus IMAP Server | =2.1.18 | |
| Cyrus IMAP Server | =2.2.8 | |
| Cyrus IMAP Server | =2.2.9 | |
| Cyrus IMAP Server | =2.2.10 | |
| Cyrus IMAP Server | =2.2.11 | |
| Cyrus IMAP Server | =2.2.12 | |
| Cyrus IMAP Server | =2.2.13 | |
| Cyrus IMAP Server | =2.2.13p1 | |
| Cyrus IMAP Server | =2.2.14 | |
| Cyrus IMAP Server | =2.3.0 | |
| Cyrus IMAP Server | =2.3.1 | |
| Cyrus IMAP Server | =2.3.2 | |
| Cyrus IMAP Server | =2.3.3 | |
| Cyrus IMAP Server | =2.3.4 | |
| Cyrus IMAP Server | =2.3.5 | |
| Cyrus IMAP Server | =2.3.6 | |
| Cyrus IMAP Server | =2.3.7 | |
| Cyrus IMAP Server | =2.3.8 | |
| Cyrus IMAP Server | =2.3.9 | |
| Cyrus IMAP Server | =2.3.10 | |
| Cyrus IMAP Server | =2.3.11 | |
| Cyrus IMAP Server | =2.3.12 | |
| Cyrus IMAP Server | =2.3.13 | |
| Cyrus IMAP Server | =2.3.14 | |
| Cyrus IMAP Server | =2.3.15 | |
| Cyrus IMAP Server | =2.4.0 | |
| Cyrus IMAP Server | =2.4.1 | |
| Cyrus IMAP Server | =2.4.2 | |
| Cyrus IMAP Server | =2.4.3 | |
| Cyrus IMAP Server | =2.4.4 | |
| Cyrus IMAP Server | =2.4.5 | |
| Cyrus IMAP Server | =2.4.6 | |
| Cyrus IMAP Server | =2.4.7 | |
| Cyrus IMAP Server | =2.4.8 | |
| Cyrus IMAP Server | =2.4.9 | |
| Cyrus IMAP Server | =2.4.10 |
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Reference Links
- http://www.osvdb.org/75307
- http://asg.andrew.cmu.edu/archive/message.php?mailbox=archive.cyrus-announce&msg=199
- http://git.cyrusimap.org/cyrus-imapd/commit/?id=0f8f026699829b65733c3081657b24e2174f4f4d
- http://securitytracker.com/id?1026031
- http://git.cyrusimap.org/cyrus-imapd/commit/?id=3244c18c928fa331f6927e2b8146abe90feafddd
- https://bugzilla.redhat.com/show_bug.cgi?id=734926
- http://secunia.com/advisories/45938
- http://www.securityfocus.com/bid/49534
- http://asg.andrew.cmu.edu/archive/message.php?mailbox=archive.cyrus-announce&msg=200
- http://www.redhat.com/support/errata/RHSA-2011-1317.html
- http://secunia.com/advisories/45975
- https://hermes.opensuse.org/messages/11723935
- http://secunia.com/advisories/46064
- http://lists.opensuse.org/opensuse-updates/2011-09/msg00019.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:149
- http://www.debian.org/security/2011/dsa-2318
- https://exchange.xforce.ibmcloud.com/vulnerabilities/69679
- https://www.cve.org/CVERecord?id=CVE-2011-3208 https://nvd.nist.gov/vuln/detail/CVE-2011-3208
- https://access.redhat.com/errata/RHSA-2011:1317
- https://access.redhat.com/security/cve/CVE-2011-3208
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=734926#c0
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=736838
- https://rhn.redhat.com/errata/RHSA-2011-1317.html
Frequently Asked Questions
What is the severity of CVE-2011-3208?
CVE-2011-3208 is considered a high severity vulnerability due to its potential for remote exploitation and arbitrary code execution.
How do I fix CVE-2011-3208?
To fix CVE-2011-3208, update your Cyrus IMAP server to version 2.4.11 or apply the appropriate patch for affected versions.
Which versions of Cyrus IMAP are affected by CVE-2011-3208?
CVE-2011-3208 affects Cyrus IMAP versions up to and including 2.3.16, with specific older versions being particularly vulnerable.
Can CVE-2011-3208 be exploited without authentication?
Yes, if the 'allowanonymouslogin' option is enabled, a malicious client can exploit CVE-2011-3208 without authentication.
What types of systems are vulnerable to CVE-2011-3208?
Systems running vulnerable versions of the Cyrus IMAP server, particularly those configured to allow anonymous logins, are at risk for CVE-2011-3208.
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