Bug 2218208 (CVE-2021-36159)

Summary: CVE-2021-36159 libfetch: an out of boundary read while libfetch uses strtol to parse the relevant numbers into address bytes leads to information leak or crash
Product: [Other] Security Response Reporter: Sandipan Roy <saroy>
Component: vulnerabilityAssignee: Nobody <nobody>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedCC: adudiak, agarcial, aoconnor, asegurap, caswilli, dffrench, gzaronik, jburrell, kaycoth, kshier, ngough, rgodfrey, stcannon, tfister, yguenane
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Hardware: All   
OS: Linux   
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Bug Blocks: 2218210    

Description Sandipan Roy 2023-06-28 13:04:36 UTC 
libfetch before 2021-07-26, as used in apk-tools, xbps, and other products, mishandles numeric strings for the FTP and HTTP protocols. The FTP passive mode implementation allows an out-of-bounds read because strtol is used to parse the relevant numbers into address bytes. It does not check if the line ends prematurely. If it does, the for-loop condition checks for the '\0' terminator one byte too late.

https://gitlab.alpinelinux.org/alpine/apk-tools/-/issues/10749
https://github.com/freebsd/freebsd-src/commits/main/lib/libfetch
https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc@%3Cdev.kafka.apache.org%3E
https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc@%3Cusers.kafka.apache.org%3E
https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7@%3Cusers.kafka.apache.org%3E
https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7@%3Cdev.kafka.apache.org%3E