CVE-2023-37457 Asterisk's PJSIP_HEADER dialplan function can overwrite memory/cause crash when using 'update'

2023-12-1419:43:30

CWE-120

GitHub_M

www.cve.org

asterisk

pjsip_header

update

vulnerability

memory overwrite

crash

dialplan

patch

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

8.4

Confidence

High

EPSS

0.001

Percentile

46.6%

JSON

Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the ‘update’ functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the ‘update’ functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.

CNA Affected

[
  {
    "vendor": "asterisk",
    "product": "asterisk",
    "versions": [
      {
        "version": "<= 18.20.0",
        "status": "affected"
      },
      {
        "version": ">= 19.0.0, <= 20.5.0",
        "status": "affected"
      },
      {
        "version": "= 21.0.0",
        "status": "affected"
      },
      {
        "version": " <= 18.9-cert5",
        "status": "affected"
      }
    ]
  }
]