Red Hat Bugzilla – Bug 709284
CVE-2011-1947 fetchmail: Application hang due unguarded blocking I/O in IMAP/POP3 STARTTLS initialization (fetchmail-SA-2011-01)
Last modified: 2015-08-22 02:47:15 EDT
It was found that fetchmail, a remote mail retrieval and forwarding utility, did not guard STARTTLS-initiated SSL/TLS negotiation in IMAP and POP3 sessions with a timeout. A malicious man-in-the-middle remote server could delay acknowledging of fetchmail's STARTTLS or STLS requests, leading to denial of fetchmail's mail-retrieval and mail-forwarding services. References: [1] http://gitorious.org/fetchmail/fetchmail/blobs/legacy_63/fetchmail-SA-2011-01.txt (upstream advisory) [2] http://www.openwall.com/lists/oss-security/2011/05/30/1 (CVE request) Upstream changeset: [3] http://gitorious.org/fetchmail/fetchmail/commit/7dc67b8cf06f74aa57525279940e180c99701314
This issue affects the versions of the fetchmail package, as shipped with Red Hat Enterprise Linux 4, 5, and 6. -- This issue affects the versions of the fetchmail package, as shipped with Fedora release of 13, 14, and 15. Please schedule an update with above upstream patch.
Created fetchmail tracking bugs for this issue Affects: fedora-all [bug 709287]
The CVE identifier of CVE-2011-1947 has been assigned to this issue.
It was reported, that to properly address this issue, it will need more invasive patches, than just backport the security fix: [4] http://www.openwall.com/lists/oss-security/2011/06/06/5
This is corrected upstream in version 6.3.20: https://gitorious.org/fetchmail/fetchmail/blobs/legacy_63/NEWS
Statement: Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.