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(for 4.9.3) CVE-2018-14881/BGP: Fix BGP_CAPCODE_RESTART.
Add a bounds check and a comment to bgp_capabilities_print(). This fixes a buffer over-read discovered by Bhargava Shastry, SecT/TU Berlin. Add a test using the capture file supplied by the reporter(s).
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| IP (tos 0x1f,CE, ttl 254, id 38671, offset 0, flags [+, DF, rsvd], proto TCP (6), length 4135, bad cksum 200 (->1fdd)!) | ||
| 226.219.0.0.179 > 16.233.34.0.100: Flags [SPUE], seq 347537408:347541483, win 511, urg 65535, options [eol], length 4075: BGP [|BGP] | ||
| Open Message (1), length: 59 | ||
| Version 255, my AS 65528, Holdtime 4324s, ID 144.8.32.4 | ||
| Optional parameters, length: 29 | ||
| Option Unknown (0), length: 0 | ||
| no decoder for option 0 | ||
| Option Capabilities Advertisement (2), length: 8 | ||
| Graceful Restart (64), length: 0 | ||
| Restart Flags: [none], Restart Time 0s | ||
| Unknown (0), length: 0 | ||
| no decoder for Capability 0 | ||
| 32-Bit AS Number (65), length: 4 | ||
| 4 Byte AS 2 | ||
| Option Unknown (0), length: 2 | ||
| no decoder for option 0 | ||
| Option Capabilities Advertisement (2), length: 2 | ||
| Unknown (232), length: 3 | ||
| no decoder for Capability 232 | ||
| 0x0000: 0207 04 | ||
| Option Capabilities Advertisement (2), length: 7 | ||
| Multiple Routes to a Destination (4), length: 0 | ||
| no decoder for Capability 4 | ||
| Unknown (8), length: 0 | ||
| no decoder for Capability 8 | ||
| Route Refresh (Cisco) (128), length: 0 | ||
| Graceful Restart (64), length: 0[|BGP] |
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