CVE-2021-32762 Integer overflow that can lead to heap overflow in redis-cli, redis-sentinel on some platforms

2021-10-0418:00:11

CWE-190

CWE-680

GitHub_M

www.cve.org

redis

integer overflow

heap overflow

vulnerability

hiredis library

network replies

heap allocation

heap allocator

jemalloc

redis versions

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

8.8

Confidence

High

EPSS

0.009

Percentile

83.2%

JSON

Redis is an open source, in-memory database that persists on disk. The redis-cli command line tool and redis-sentinel service may be vulnerable to integer overflow when parsing specially crafted large multi-bulk network replies. This is a result of a vulnerability in the underlying hiredis library which does not perform an overflow check before calling the calloc() heap allocation function. This issue only impacts systems with heap allocators that do not perform their own overflow checks. Most modern systems do and are therefore not likely to be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator which is also not vulnerable. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14.

CNA Affected

[
  {
    "product": "redis",
    "vendor": "redis",
    "versions": [
      {
        "status": "affected",
        "version": "< 5.0.14"
      },
      {
        "status": "affected",
        "version": ">= 6.0.0, < 6.0.16"
      },
      {
        "status": "affected",
        "version": ">= 6.2.0, < 6.2.6"
      }
    ]
  }
]