CVE-2012-0876
expat: hash table collisions CPU usage DoS
Severity Score
4.3
*CVSS v2
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
The XML parser (xmlparse.c) in expat before 2.1.0 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via an XML file with many identifiers with the same value.
El analizador XML (xmlparse.c) en expat antes de v2.1.0 calcula los valores de hash sin restringir la capacidad de desencadenar colisiones hash de forma predecible, lo que permite causar una denegación de servicio (por consumo de CPU) a atacantes dependientes de contexto a través de un archivo XML con muchos identificadores con el mismo valor.
A denial of service flaw was found in the implementation of hash arrays in Expat. An attacker could use this flaw to make an application using Expat consume an excessive amount of CPU time by providing a specially crafted XML file that triggers multiple hash function collisions. To mitigate this issue, randomization has been added to the hash function to reduce the chance of an attacker successfully causing intentional collisions.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2012-01-19 CVE Reserved
- 2012-03-28 CVE Published
- 2023-07-28 EPSS Updated
- 2024-08-06 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-400: Uncontrolled Resource Consumption
- CWE-407: Inefficient Algorithmic Complexity
CAPEC
References (24)
| URL | Tag | Source |
|---|---|---|
| http://bugs.python.org/issue13703#msg151870 | Issue Tracking | |
| http://mail.libexpat.org/pipermail/expat-discuss/2012-March/002768.html | Broken Link | |
| http://secunia.com/advisories/49504 | Not Applicable | |
| http://secunia.com/advisories/51024 | Not Applicable | |
| http://secunia.com/advisories/51040 | Not Applicable | |
| http://sourceforge.net/projects/expat/files/expat/2.1.0 | Release Notes | |
| http://sourceforge.net/tracker/?func=detail&atid=110127&aid=3496608&group_id=10127 | Third Party Advisory | |
| http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html | Third Party Advisory |
|
| http://www.securityfocus.com/bid/52379 | Third Party Advisory | |
| https://kc.mcafee.com/corporate/index?page=content&id=SB10365 | Broken Link | |
| https://support.apple.com/HT205637 | Third Party Advisory |
|
| https://www.tenable.com/security/tns-2016-20 | Third Party Advisory |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html | 2022-08-05 | |
| http://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html | 2022-08-05 | |
| http://rhn.redhat.com/errata/RHSA-2012-0731.html | 2022-08-05 | |
| http://rhn.redhat.com/errata/RHSA-2016-0062.html | 2022-08-05 | |
| http://rhn.redhat.com/errata/RHSA-2016-2957.html | 2022-08-05 | |
| http://www.debian.org/security/2012/dsa-2525 | 2022-08-05 | |
| http://www.mandriva.com/security/advisories?name=MDVSA-2012:041 | 2022-08-05 | |
| http://www.ubuntu.com/usn/USN-1527-1 | 2022-08-05 | |
| http://www.ubuntu.com/usn/USN-1613-1 | 2022-08-05 | |
| http://www.ubuntu.com/usn/USN-1613-2 | 2022-08-05 | |
| https://access.redhat.com/security/cve/CVE-2012-0876 | 2017-11-16 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=786617 | 2017-11-16 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Libexpat Project Search vendor "Libexpat Project" | Libexpat Search vendor "Libexpat Project" for product "Libexpat" | < 2.1.0 Search vendor "Libexpat Project" for product "Libexpat" and version " < 2.1.0" | - |
Affected
| ||||||
| Python Search vendor "Python" | Python Search vendor "Python" for product "Python" | >= 2.6.0 < 2.6.8 Search vendor "Python" for product "Python" and version " >= 2.6.0 < 2.6.8" | - |
Affected
| ||||||
| Python Search vendor "Python" | Python Search vendor "Python" for product "Python" | >= 2.7.0 < 2.7.3 Search vendor "Python" for product "Python" and version " >= 2.7.0 < 2.7.3" | - |
Affected
| ||||||
| Python Search vendor "Python" | Python Search vendor "Python" for product "Python" | >= 3.1.0 < 3.1.5 Search vendor "Python" for product "Python" and version " >= 3.1.0 < 3.1.5" | - |
Affected
| ||||||
| Python Search vendor "Python" | Python Search vendor "Python" for product "Python" | >= 3.2.0 < 3.2.3 Search vendor "Python" for product "Python" and version " >= 3.2.0 < 3.2.3" | - |
Affected
| ||||||
| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 6.0 Search vendor "Debian" for product "Debian Linux" and version "6.0" | - |
Affected
| ||||||
| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 7.0 Search vendor "Debian" for product "Debian Linux" and version "7.0" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 8.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "8.04" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 10.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "10.04" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 11.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "11.04" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 11.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "11.10" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04" | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Solaris Search vendor "Oracle" for product "Solaris" | 11.3 Search vendor "Oracle" for product "Solaris" and version "11.3" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Storage Search vendor "Redhat" for product "Storage" | 2.0 Search vendor "Redhat" for product "Storage" and version "2.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Desktop Search vendor "Redhat" for product "Enterprise Linux Desktop" | 5.0 Search vendor "Redhat" for product "Enterprise Linux Desktop" and version "5.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Desktop Search vendor "Redhat" for product "Enterprise Linux Desktop" | 6.0 Search vendor "Redhat" for product "Enterprise Linux Desktop" and version "6.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Eus Search vendor "Redhat" for product "Enterprise Linux Eus" | 6.2 Search vendor "Redhat" for product "Enterprise Linux Eus" and version "6.2" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Server Search vendor "Redhat" for product "Enterprise Linux Server" | 5.0 Search vendor "Redhat" for product "Enterprise Linux Server" and version "5.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Server Search vendor "Redhat" for product "Enterprise Linux Server" | 6.0 Search vendor "Redhat" for product "Enterprise Linux Server" and version "6.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Server Aus Search vendor "Redhat" for product "Enterprise Linux Server Aus" | 6.2 Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "6.2" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Workstation Search vendor "Redhat" for product "Enterprise Linux Workstation" | 5.0 Search vendor "Redhat" for product "Enterprise Linux Workstation" and version "5.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Workstation Search vendor "Redhat" for product "Enterprise Linux Workstation" | 6.0 Search vendor "Redhat" for product "Enterprise Linux Workstation" and version "6.0" | - |
Affected
| ||||||