Bug 2218208 (CVE-2021-36159) - 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
Summary: CVE-2021-36159 libfetch: an out of boundary read while libfetch uses strtol t...
Keywords:
Status: NEW
Alias: CVE-2021-36159
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Nobody
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Blocks: 2218210
TreeView+ depends on / blocked
 
Reported: 2023-06-28 13:04 UTC by Sandipan Roy
Modified: 2023-10-30 13:45 UTC (History)
15 users (show)

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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
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