Bug 107140
| Summary: | CAN-2003-0795 Remote DoS in zebra | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | jonny robertson <jonny> |
| Component: | zebra | Assignee: | Jay Fenlason <fenlason> |
| Status: | CLOSED ERRATA | QA Contact: | David Lawrence <dkl> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 9 | CC: | jfeeney, thl |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | i686 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2003-11-13 08:32:26 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
I've assigned CAN-2003-0795 to track this issue Errata is in progress with a patch to correct this issue, will be RHSA-2003:307 An errata has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2003-307.html This bug doesnt only affect port 2601 (zebra itself) but rather all ports zebra listens on (2605/bgpd for example), too. adding the option "-A 127.0.0.1" to your daemon's startscripts will prevent connections from the outside. Please note that -A option is largely broken on Zebra v0.93b, see zebra.patch on http://cvs.openpkg.org/chngview?cn=11017 |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5b) Gecko/20030831 Description of problem: A remote DoS condition exists in zebra when layer 3 access is possible to the telnet management port (2601/tcp). By sending a telnet option delimiter with no actual option data, zebra will make a bad memory call and SIGSEV. Have tested/confirmed against all zebra versions from 0.90a to 0.93b. Version-Release number of selected component (if applicable): zebra-0.93b-1 How reproducible: Always Steps to Reproduce: 1. Run zebra on a machine. 2. From another machine run: printf '\xff\xf0\xff\xf0\xff\xf0' | nc <zebra-host> 2601 3. zebra dies. Actual Results: Routing daemon goes boom :( Expected Results: Zebra should handle this condition. Additional info: Program received signal SIGSEGV, Segmentation fault. 0x08051db8 in vty_telnet_option (vty=0x80855b0, buf=0x0, nbytes=452) at vty.c:1141 1141 char *buffer = (char *)vty->sb_buffer->head->data; (gdb) bt #0 0x08051db8 in vty_telnet_option (vty=0x80855b0, buf=0x0, nbytes=452) at vty.c:1141 #1 0x08051fb5 in vty_read (thread=0xbfffe7ac) at vty.c:1289 #2 0x08058ab0 in thread_call (thread=0xbfffea30) at thread.c:627 #3 0x0804b4e0 in main (argc=0, argv=0xbfffea30) at main.c:310 #4 0x420156a4 in __libc_start_main () from /lib/tls/libc.so.6