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authorPaul Jakma <paul.jakma@sun.com>2007-04-10 19:36:48 +0000
committerPaul Jakma <paul.jakma@sun.com>2007-04-10 19:36:48 +0000
commit6e4ab12f1504caa95edc7702a82f118d0de15a0a (patch)
tree50b6784229f92d404e5d6509848c135395743f2f /ospf6d
parent16d2e2410d6e8cf53fac05b956f3e7ee53bc7234 (diff)
[bgpd] Bug #354: Take care to keep reads of MP_(UN)REACH_NLRI in bounds
2007-04-08 Paul Jakma <paul.jakma@sun.com> * bgp_attr.c: (general) Bug #354: parsing of MP_REACH_NLRI and MP_UNREACH_NLRI does not take sufficient care to ensure reads from stream buffer stay in-bounds. Hence bgpd may attempt to read beyond end of stream, if given a crafted packet. As it uses the stream access methods to do so, this will typically result in assert() being hit in stream.c. Where code is compiled without assert() enabled, result is unknown. (struct message attr_str) should be static. (bgp_mp_reach_parse) Carefully check length remaining in stream against amount desired to read from stream, prior to each read, particularly where lengths are conditional on data obtained from stream - using STREAM_READABLE. Remove code to parse SNPA-number, it's a defunct field and changed to a fixed size in latest BGP MP update RFC - log warning if SNPA-number is not 0. (bgp_mp_unreach_parse) Check withdraw_length carefully against STREAM_READABLE. (bgp_attr_parse) If attribute-parser function returns error, log warning. Log attribute type on mismatch.
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