Ubuntu.comUB:CVE-2021-32765CVE-2021-32765
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
0.025 Low
EPSS
Percentile
89.9%
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 inSIZE_MAX. If it can not, and thecalloc()` 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
context option to a value small enough that no overflow is possible.
Notes
| Author | Note |
|---|---|
| seth-arnold | This feels like a bug in calloc() implementation, not in Hiredis. I’m marking this not-affected for us because our calloc(3) should do the right thing. |
References
github.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2
launchpad.net/bugs/cve/CVE-2021-32765
nvd.nist.gov/vuln/detail/CVE-2021-32765
security-tracker.debian.org/tracker/CVE-2021-32765
wiki.sei.cmu.edu/confluence/display/c/MEM07-C.+Ensure+that+the+arguments+to+calloc%28%29%2C+when+multiplied%2C+do+not+wrap
www.cve.org/CVERecord?id=CVE-2021-32765
Related
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
0.025 Low
EPSS
Percentile
89.9%