Date: Tue, 30 Sep 2014 18:41:17 +0200 From: Rainer Gerhards <rgerhards@...adiscon.com> To: Solar Designer <solar@...nwall.com> Cc: oss-security@...ts.openwall.com Subject: Re: vulnerability in rsyslog 2014-09-30 18:28 GMT+02:00 Solar Designer <solar@...nwall.com>: > On Tue, Sep 30, 2014 at 01:55:12PM +0200, Sven Kieske wrote: > > I don't understand the following statement in the > > pri-vuln.txt in section "Patches": > > > > "Version 7.4.6, while no longer being project > > supported received a patch and is also not vulnerable." > > > > What was patched when this version is not vulnerable? > > Or do you mean it is not vulnerable after the patch got applied? > > My apologies, this is a type that skipped past all proof-reading. It should say "7.6.6", which is the v7 version released today. v7.4.x is not only non-project supported, it's also heavily outdated and missing many other patches as well (just to point this out). > I think Rainer is not subscribed to oss-security. I've just added him > to CC on this reply. Rainer - please address Sven's questions above. > yes, not subscribed, please CC me for follow-up questions. > > All - please note that the bug is likely present in many other syslog > services. It likely dates back all the way to Eric Allman's syslog, > although I have not checked to make sure yet. > > pri-vuln.txt in the tarball attached to Rainer's message specifically > mentions sysklogd as "mildly affected": > > | Affected > | -------- > | - rsyslog, most probably all versions (checked 5.8.6+) > | - sysklogd (checked most recent versions) > | - potentially others (see root cause) > > [...] > > | sysklogd > | ~~~~~~~~ > | Sysklogd is mildly affected. Having a quick look at the current git > master > | branch, the wrong action may be applied to messages with invalid > facility. > | > | A segfault seems unlikely, as the maximum misadressing is 104 bytes of > the > | f_pmask table, which is always within properly allocated memory (albeit > to > | wrong data items). This can lead to triggering invalid selector lines and > | thus wrongly writing to files or wrongly forwarding to other hosts. > > I also wouldn't outrule that other *applications* fell into the the same trap of the delta between the defines for NFACILITIES and the facility mask. If an app processes syslog messages based on facility/severity values, it probably is a good idea to check how it does that. Thanks for the follow-up and cc'ing! Rainer
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