oss-sec mailing list archives
Re: sysklogd vulnerability (CVE-2014-3634)
From: Solar Designer <solar () openwall com>
Date: Fri, 3 Oct 2014 15:26:09 +0400
On Fri, Oct 03, 2014 at 11:24:43AM +0000, mancha wrote:
On Fri, Oct 03, 2014 at 09:12:28AM +0000, mancha wrote:In sysklogd's syslogd, invalid priority values between 192 and 1023 (directly or arrived at via overflow wraparound) can propagate through code causing out-of-bounds access to the f_pmask array within the 'filed' structure by up to 104 bytes past its end. Though most likely insufficient to reach unallocated memory because there are around 544 bytes past f_pmask in 'filed' (mod packing and other differences), incorrect access of fields at higher positions of the 'filed' structure definition can cause unexpected behavior including message mis-classification, forwarding issues, message loss, or other.To expand on the above, because the out-of-bounds access is limited to the filed structure, the effect on message handling, etc. appears limited to the would-be attacker's own message. Unlike the more serious impact seen in rsyslog, my limited testing and code review suggests the flaw, while there, has no real security impact. Nevertheless, my patch fixes the handling of malformed PRI parts.
What about the DoS impact claimed here, though? - http://www.rsyslog.com/remote-syslog-pri-vulnerability-cve-2014-3683/ sysklogd ~~~~~~~~ A segfault seems possible in sysklogd if a negative facility value (due to integer overrun in facility parsing) is used. This could be used to carry out a remote DoS. If this can be used to crash syslogd, it's "real security impact", even if rather limited. Have you tried triggering this condition (getting syslogd to crash)? Alexander
Current thread:
- sysklogd vulnerability (CVE-2014-3634) mancha (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) mancha (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) Solar Designer (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) Rainer Gerhards (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) mancha (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) Rainer Gerhards (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) mancha (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) Rainer Gerhards (Oct 05)
- Re: sysklogd vulnerability (CVE-2014-3634) mancha (Oct 06)
- Re: sysklogd vulnerability (CVE-2014-3634) Solar Designer (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) mancha (Oct 03)
- Re: sysklogd vulnerability (CVE-2014-3634) mancha (Oct 03)