Vulnerability Name:

CVE-2017-16944 (CCN-135479)

Assigned:2017-11-25
Published:2017-11-25
Updated:2021-05-04
Summary:The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT commands and an improper check for a '.' character signifying the end of the content, related to the bdat_getc function.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/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): None
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:N/A:H)
6.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/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): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-835
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2017-16944

Source: MISC
Type: Mailing List
http://openwall.com/lists/oss-security/2017/11/25/1

Source: MISC
Type: Mailing List
http://openwall.com/lists/oss-security/2017/11/25/2

Source: MISC
Type: Mailing List
http://openwall.com/lists/oss-security/2017/11/25/3

Source: CCN
Type: Exim Web site
Exim Internet Mailer

Source: MLIST
Type: UNKNOWN
[oss-security] 20210504 21Nails: Multiple vulnerabilities in Exim

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1039873

Source: CCN
Type: Bugzilla – Bug 2201
Exim handles BDAT data incorrectly and leads to crash

Source: MISC
Type: Exploit, Issue Tracking
https://bugs.exim.org/show_bug.cgi?id=2201

Source: XF
Type: UNKNOWN
exim-cve201716944-dos(135479)

Source: MISC
Type: Mailing List
https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html

Source: CCN
Type: Packet Storm Security [11-27-2017]
Exim 4.89 Denial Of Service

Source: DEBIAN
Type: Third Party Advisory
DSA-4053

Source: EXPLOIT-DB
Type: EXPLOIT
Offensive Security Exploit Database [11-27-2017]

Source: EXPLOIT-DB
Type: Third Party Advisory, VDB Entry
43184

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2017-16944

Vulnerable Configuration:Configuration 1:
  • cpe:/a:exim:exim:4.88:*:*:*:*:*:*:*
  • OR cpe:/a:exim:exim:4.89:*:*:*:*:*:*:*

  • Configuration 2:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/a:exim:exim:4.89:*:*:*:*:*:*:*
  • OR cpe:/a:exim:exim:4.88:*:*:*:*:*:*:*

  • * 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: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: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:111368
    P
    Security update for exim (Critical)
    2021-05-07
    oval:com.ubuntu.trusty:def:201716944000
    V
    CVE-2017-16944 on Ubuntu 14.04 LTS (trusty) - medium.
    2017-11-27
    oval:com.ubuntu.xenial:def:201716944000
    V
    CVE-2017-16944 on Ubuntu 16.04 LTS (xenial) - medium.
    2017-11-27
    oval:com.ubuntu.artful:def:201716944000
    V
    CVE-2017-16944 on Ubuntu 17.10 (artful) - medium.
    2017-11-25
    oval:com.ubuntu.xenial:def:2017169440000000
    V
    CVE-2017-16944 on Ubuntu 16.04 LTS (xenial) - medium.
    2017-11-25
    BACK
    exim exim 4.88
    exim exim 4.89
    debian debian linux 9.0
    exim exim 4.89
    exim exim 4.88