Vulnerability Name:

CVE-2017-12963 (CCN-130730)

Assigned:2017-08-16
Published:2017-08-16
Updated:2017-08-21
Summary:There is an illegal address access in Sass::Eval::operator() in eval.cpp of LibSass 3.4.5, leading to a remote denial of service attack.
Note: this is similar to CVE-2017-11555 but remains exploitable after the vendor's CVE-2017-11555 fix (available from GitHub after 2017-07-24).
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)
6.6 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: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): 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)
6.6 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: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): 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-125
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2017-12963

Source: CCN
Type: LibSass Web site
LibSass

Source: CCN
Type: Red Hat Bugzilla – Bug 1482335
There is an illegal address access in libsass that is similar as Bug 1471782 which is fixed by vendor.

Source: MISC
Type: Issue Tracking, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1482335

Source: XF
Type: UNKNOWN
libsass-cve201712963-dos(130730)

Vulnerable Configuration:Configuration 1:
  • cpe:/a:libsass:libsass:3.4.5:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:libsass:libsass:3.4.5:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.disco:def:2017129630000000
    V
    		CVE-2017-12963 on Ubuntu 19.04 (disco) - low.
    2017-08-18
    oval:com.ubuntu.artful:def:201712963000
    V
    		CVE-2017-12963 on Ubuntu 17.10 (artful) - low.
    2017-08-18
    oval:com.ubuntu.cosmic:def:2017129630000000
    V
    		CVE-2017-12963 on Ubuntu 18.10 (cosmic) - low.
    2017-08-18
    oval:com.ubuntu.bionic:def:201712963000
    V
    		CVE-2017-12963 on Ubuntu 18.04 LTS (bionic) - low.
    2017-08-18
    oval:com.ubuntu.bionic:def:2017129630000000
    V
    		CVE-2017-12963 on Ubuntu 18.04 LTS (bionic) - low.
    2017-08-18
    oval:com.ubuntu.cosmic:def:201712963000
    V
    		CVE-2017-12963 on Ubuntu 18.10 (cosmic) - low.
    2017-08-18
    oval:com.ubuntu.xenial:def:2017129630000000
    V
    		CVE-2017-12963 on Ubuntu 16.04 LTS (xenial) - low.
    2017-08-18
    oval:com.ubuntu.xenial:def:201712963000
    V
    		CVE-2017-12963 on Ubuntu 16.04 LTS (xenial) - low.
    2017-08-18
    BACK
    libsass libsass 3.4.5
    libsass libsass 3.4.5