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Bug 873076 (CVE-2021-32765) - [Tracker] Integer overflow in bundled hiredis
Summary: [Tracker] Integer overflow in bundled hiredis
Status: CONFIRMED
Alias: CVE-2021-32765
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
URL:
Whiteboard:
Keywords:
Depends on: 816318 821346 873079
Blocks:
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Reported: 2022-09-26 16:11 UTC by John Helmert III
Modified: 2022-10-22 01:49 UTC (History)
0 users

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Runtime testing required: ---


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Description John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2022-09-26 16:11:50 UTC
CVE-2021-32765 (https://wiki.sei.cmu.edu/confluence/display/c/MEM07-C.+Ensure+that+the+arguments+to+calloc%28%29%2C+when+multiplied%2C+do+not+wrap):

Hiredis is a minimalistic C client library for the Redis database. In affected versions Hiredis is vulnurable to integer overflow if provided maliciously crafted or corrupted `RESP` `mult-bulk` protocol data. When parsing `multi-bulk` (array-like) replies, hiredis fails to check if `count * sizeof(redisReply*)` can be represented in `SIZE_MAX`. If it can not, and the `calloc()` call doesn't itself make this check, it would result in a short allocation and subsequent buffer overflow. Users of hiredis who are unable to update may set the [maxelements](https://github.com/redis/hiredis#reader-max-array-elements) context option to a value small enough that no overflow is possible.