Vulnerability Name:

CVE-2020-28018 (CCN-201191)

Assigned:2020-10-30
Published:2021-05-04
Updated:2021-05-26
Summary:Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.6 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
6.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-416
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-28018

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210511 Re: [CVE-2020-28018] Use-After-Free on Exim Question

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210511 Re: [CVE-2020-28018] Use-After-Free on Exim Question

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210511 Re: [CVE-2020-28018] Use-After-Free on Exim Question

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210511 [CVE-2020-28018] Use-After-Free on Exim Question

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210511 Re: [CVE-2020-28018] Use-After-Free on Exim Question

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210512 Re: [CVE-2020-28018] Use-After-Free on Exim Question

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210512 Re: [CVE-2020-28018] Use-After-Free on Exim Question

Source: XF
Type: UNKNOWN
exim-cve202028018-sec-bypass(201191)

Source: CCN
Type: oss-sec Mailing List, Tue, 4 May 2021 13:50:13 +0000
21Nails: Multiple vulnerabilities in Exim

Source: CCN
Type: Exim Web site
Exim

Source: MISC
Type: Vendor Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txt

Vulnerable Configuration:Configuration 1:
  • cpe:/a:exim:exim:*:*:*:*:*:*:*:* (Version >= 4.90 and < 4.94.2)

  • Configuration CCN 1:
  • cpe:/a:exim:exim:*:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:112207
    P
    exim-4.94.2-4.2 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:100366
    P
    (Moderate)
    2021-12-16
    oval:org.opensuse.security:def:105738
    P
    exim-4.94.2-4.2 on GA media (Moderate)
    2021-10-01
    oval:org.opensuse.security:def:93653
    P
    Security update for exim (Critical)
    2021-05-20
    oval:org.opensuse.security:def:109831
    P
    Security update for exim (Critical)
    2021-05-20
    oval:org.opensuse.security:def:96484
    P
    Security update for exim (Critical)
    2021-05-20
    oval:org.opensuse.security:def:11216
    P
    Security update for exim (Critical)
    2021-05-20
    oval:org.opensuse.security:def:11217
    P
    Security update for exim (Critical)
    2021-05-20
    oval:org.opensuse.security:def:103174
    P
    Security update for exim (Critical)
    2021-05-20
    oval:org.opensuse.security:def:107032
    P
    Security update for exim (Critical)
    2021-05-20
    oval:org.opensuse.security:def:111368
    P
    Security update for exim (Critical)
    2021-05-07
    BACK
    exim exim *
    exim exim *