Vulnerability Name:

CVE-2018-7753 (CCN-140064)

Assigned:2018-03-07
Published:2018-03-07
Updated:2018-03-29
Summary:An issue was discovered in Bleach 2.1.x before 2.1.3. Attributes that have URI values weren't properly sanitized if the values contained character entities. Using character entities, it was possible to construct a URI value with a scheme that was not allowed that would slide through unsanitized.
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)
8.5 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:O/RC:C)
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
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)
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): Low
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
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-20
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2018-7753

Source: MISC
Type: Third Party Advisory
https://bugs.debian.org/892252

Source: CCN
Type: Debian Bug report logs - #892252
python-bleach: CVE-2018-7753: URI values with character entities not properly sanitized

Source: XF
Type: UNKNOWN
bleach-cve20187753-sec-bypass(140064)

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/mozilla/bleach/commit/c5df5789ec3471a31311f42c2d19fc2cf21b35ef

Source: MISC
Type: Third Party Advisory
https://github.com/mozilla/bleach/releases/tag/v2.1.3

Source: CCN
Type: Python Web site
Bleach package

Vulnerable Configuration:Configuration 1:
  • cpe:/a:mozilla:bleach:2.1:*:*:*:*:*:*:*
  • OR cpe:/a:mozilla:bleach:2.1.1:*:*:*:*:*:*:*
  • OR cpe:/a:mozilla:bleach:2.1.2:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:113256
    P
    		python36-bleach-3.3.0-1.4 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:106668
    P
    		python36-bleach-3.3.0-1.4 on GA media (Moderate)
    2021-10-01
    oval:com.ubuntu.xenial:def:201877530000000
    V
    		CVE-2018-7753 on Ubuntu 16.04 LTS (xenial) - untriaged.
    2018-03-07
    oval:com.ubuntu.artful:def:20187753000
    V
    		CVE-2018-7753 on Ubuntu 17.10 (artful) - untriaged.
    2018-03-07
    oval:com.ubuntu.xenial:def:20187753000
    V
    		CVE-2018-7753 on Ubuntu 16.04 LTS (xenial) - untriaged.
    2018-03-07
    oval:com.ubuntu.disco:def:201877530000000
    V
    		CVE-2018-7753 on Ubuntu 19.04 (disco) - untriaged.
    2018-03-07
    oval:com.ubuntu.bionic:def:20187753000
    V
    		CVE-2018-7753 on Ubuntu 18.04 LTS (bionic) - untriaged.
    2018-03-07
    oval:com.ubuntu.cosmic:def:201877530000000
    V
    		CVE-2018-7753 on Ubuntu 18.10 (cosmic) - untriaged.
    2018-03-07
    oval:com.ubuntu.cosmic:def:20187753000
    V
    		CVE-2018-7753 on Ubuntu 18.10 (cosmic) - untriaged.
    2018-03-07
    oval:com.ubuntu.bionic:def:201877530000000
    V
    		CVE-2018-7753 on Ubuntu 18.04 LTS (bionic) - untriaged.
    2018-03-07
    oval:com.ubuntu.trusty:def:20187753000
    V
    		CVE-2018-7753 on Ubuntu 14.04 LTS (trusty) - untriaged.
    2018-03-07
    BACK
    mozilla bleach 2.1
    mozilla bleach 2.1.1
    mozilla bleach 2.1.2