Uncontrolled recursion in the HTTP\/2 HPACK decoder in Apache bRPC before 1.18.0 allows remote attackers to cause denial of service by sending a crafted HTTP\/2 header block containing many consecutive Dynamic Table Size Update entries. Each update was decoded by recursively invoking the HPACK decoder, which could exhaust the thread stack before a header field or end of input was reached.<\/p>\n
Root Cause:
\nThe bRPC HPACK decoder recursively decoded the next entry after processing a Dynamic Table Size Update. The decoder did not bound the recursion depth, so a long sequence of update entries could consume excessive stack space.<\/p>\n
Affected Scenarios:
\nUse bRPC with the built-in HTTP\/2 implementation to accept HTTP\/2 traffic from an untrusted network.<\/p>\n
How to Fix:
\n1. Upgrade bRPC to version 1.18.0, which fixes this issue.
\n2. Apply this patch: https:\/\/github.com\/apache\/brpc\/pull\/3343 <\/p>\n
Note:
\nThe fix changes HPACK Dynamic Table Size Update decoding to use iterative parsing instead of recursive parsing.<\/p>\n","protected":false},"excerpt":{"rendered":"
Uncontrolled recursion in the HTTP\/2 HPACK decoder in Apache bRPC before 1.18.0 allows remote attackers to cause denial of service by sending a crafted HTTP\/2 header block containing many consecutive <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-44024","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/44024","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=44024"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=44024"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=44024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}