line 727 in imfile.c :
memcpy(dirn, inst->pszFileName, i); /* do not copy slash */
On Thu, Mar 3, 2016 at 8:53 AM, Brian Knox <[email protected]> wrote:
> I've found a buffer overflow in imfile in the master-candidate branch. To
> reproduce, make an imfile config that uses a relative path rather than
> absolute to a file:
>
> ```
> module(load="imfile" PollingInterval="10")
>
> input(
> type="imfile"
> tag="crash"
> File="crashme"
> )
>
> *.* /var/log/syslog
> ```
>
> This results in:
>
> ```
> 3146.392981790:main thread : deletestateonfiledelete: (unset)
> 3146.392987727:main thread : addmetadata: (unset)
> 3146.392993638:main thread : addceetag: (unset)
> 3146.392999527:main thread : statefile: (unset)
> *** buffer overflow detected ***: rsyslogd terminated
> ======= Backtrace: =========
> /lib/x86_64-linux-gnu/libc.so.6(+0x7338f)[0x7f286982b38f]
> /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f28698c2c9c]
> /lib/x86_64-linux-gnu/libc.so.6(+0x109b60)[0x7f28698c1b60]
> /usr/local/lib/rsyslog/imfile.so(+0x22cd)[0x7f286919f2cd]
> /usr/local/lib/rsyslog/imfile.so(+0x254d)[0x7f286919f54d]
> rsyslogd(inputProcessCnf+0x99)[0x4147a9]
> rsyslogd(cnfDoObj+0x90)[0x414ba0]
> rsyslogd(yyparse+0xbae)[0x45435e]
> rsyslogd(load+0xc35)[0x414145]
> rsyslogd(initAll+0x5ef)[0x448e2f]
> rsyslogd(main+0x30)[0x40dfe0]
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7f28697d9ec5]
> rsyslogd[0x40e35a]
> ```
>
> I don't have time to dig into it today but wanted to go ahead and report
> it. If I correctly use an absolute path to the file (I used a relative by
> mistake when testing and found this), things work as expected.
>
> If I get some time tomorrow to dig into it I will!
>
> Cheers,
> Brian
>
>
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