Headline
CVE-2022-46149: Apply data offset for list-of-pointers at access time rather than Lis… · capnproto/capnproto@25d34c6
Cap’n Proto is a data interchange format and remote procedure call (RPC) system. Cap’n Proro prior to versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3, as well as versions of Cap’n Proto’s Rust implementation prior to 0.13.7, 0.14.11, and 0.15.2 are vulnerable to out-of-bounds read due to logic error handling list-of-list. This issue may lead someone to remotely segfault a peer by sending it a malicious message, if the victim performs certain actions on a list-of-pointer type. Exfiltration of memory is possible if the victim performs additional certain actions on a list-of-pointer type. To be vulnerable, an application must perform a specific sequence of actions, described in the GitHub Security Advisory. The bug is present in inlined code, therefore the fix will require rebuilding dependent applications. Cap’n Proto has C++ fixes available in versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3. The capnp Rust crate has fixes available in versions 0.13.7, 0.14.11, and 0.15.2.
@@ -1227,8 +1227,12 @@ inline Void ListReader::getDataElement<Void>(ElementCount index) const { }
inline PointerReader ListReader::getPointerElement(ElementCount index) const { // If the list elements have data sections we need to skip those. Note that for pointers to be // present at all (which already must be true if we get here), then `structDataSize` must be a // whole number of words, so we don’t have to worry about unaligned reads here. auto offset = structDataSize / BITS_PER_BYTE; return PointerReader(segment, capTable, reinterpret_cast<const WirePointer*>( ptr + upgradeBound<uint64_t>(index) * step / BITS_PER_BYTE), nestingLimit); ptr + offset + upgradeBound<uint64_t>(index) * step / BITS_PER_BYTE), nestingLimit); }
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Red Hat OpenShift Container Platform release 4.12.9 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.12. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2022-46149: A flaw was found in capnproto and capnp projects where a specially-crafted pointer could escape bounds checking by exploiting inconsistent handling of pointers when a list-of-structs ...
The Cap'n Proto library and capnp Rust package are vulnerable to out-of-bounds read due to logic error handling list-of-list. If a message consumer expects data of type "list of pointers", and if the consumer performs certain specific actions on such data, then a message producer can cause the consumer to read out-of-bounds memory. This could trigger a process crash in the consumer, or in some cases could allow exfiltration of private in-memory data. Impact ====== - Remotely segfault a peer by sending it a malicious message, if the victim performs certain actions on a list-of-pointer type. - Possible exfiltration of memory, if the victim performs additional certain actions on a list-of-pointer type. - To be vulnerable, an application must perform a specific sequence of actions, described below. At present, **we are not aware of any vulnerable application**, but we advise updating regardless. Fixed in ======== Unfortunately, the bug is present in inlined code, therefore the fix will...