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ubuntucveUbuntu.comUB:CVE-2020-24342
HistoryAug 13, 2020 - 12:00 a.m.

CVE-2020-24342

2020-08-1300:00:00
ubuntu.com
ubuntu.com
13
lua 5.4.0
cve-2020-24342
stack redzone
luao_pushvfstring
protection mechanism
luad_callnoyield

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.001

Percentile

50.1%

Lua through 5.4.0 allows a stack redzone cross in luaO_pushvfstring because
a protection mechanism wrongly calls luaD_callnoyield twice in a row.

Notes

Author Note
mdeslaur couldn’t reproduce on lua earlier than 5.4, and problematic code doesn’t seem present. Marking as not-affected.

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.001

Percentile

50.1%