CVE-2021-32765: Integer Overflow to Buffer Overflow in Hiredis
First published: Mon Oct 04 2021(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Redis Hiredis | <1.0.1 | |
| Debian Debian Linux | =9.0 | |
| Netapp Management Services For Element Software And Netapp Hci |
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Reference Links
- https://github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1e
- https://github.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2
- https://lists.debian.org/debian-lts-announce/2021/10/msg00007.html
- https://security.gentoo.org/glsa/202210-32
- https://security.netapp.com/advisory/ntap-20211104-0003/
- 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
Frequently Asked Questions
What is CVE-2021-32765?
CVE-2021-32765 is a vulnerability in the Hiredis C client library for Redis that allows for integer overflow when parsing multi-bulk protocol data.
How can this vulnerability be exploited?
This vulnerability can be exploited by providing maliciously crafted or corrupted multi-bulk protocol data to the Hiredis library, triggering an integer overflow.
What is the severity of CVE-2021-32765?
The severity of CVE-2021-32765 is rated as high, with a CVSS score of 8.8.
Which software versions are affected by CVE-2021-32765?
Versions up to and excluding Hiredis 1.0.1, Debian Linux 9.0, and Netapp Management Services for Element Software and Netapp HCI are affected by CVE-2021-32765.
How can I fix CVE-2021-32765?
To fix CVE-2021-32765, it is recommended to update to a patched version of the affected software or apply the necessary security patches.
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