Описание
A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.
Отчет
All supported Red Hat offerings are built with the compilation flag (-fstack-clash-protection) which reduces the impact to Moderate. This build configuration blocks the possibility of an attacker gaining arbitrary code execution even if a stack-clash vulnerability, like this one, could be exploited.
This vulnerability is rated Moderate because Red Hat builds use the -fstack-clash-protection compiler flag, which mitigates the risk of arbitrary code execution from stack overflows. While the flaw allows a crash via uncontrolled recursion in XML parsing, the hardened stack layout prevents reliable memory corruption, limiting the impact to a Denial of Service (DoS) scenario.
Within regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-674: Uncontrolled Recursion vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.
Input validation controls ensure that inputs triggering recursion are validated to stay within safe limits, which reduces the risk of infinite or excessive recursion. The implementation of least functionality on the platform further restricts potential impacts of recursions by disabling unnecessary recursive functions or features, thus reducing the available pathways for a would-be attacker. The inclusion of developer testing and evaluation ensures that recursive functions are tested and that safeguards like error handling are in place. In the case of successful exploitation, detection and containment controls are in place to limit impacts by alerting on anomalous system behavior in real time, while process isolation can limit impacts to a single process.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | compat-expat1 | Out of support scope | ||
| Red Hat Enterprise Linux 6 | expat | Out of support scope | ||
| Red Hat Enterprise Linux 7 | expat | Out of support scope | ||
| Red Hat Enterprise Linux 7 | firefox | Out of support scope | ||
| Red Hat Enterprise Linux 7 | thunderbird | Out of support scope | ||
| Red Hat Enterprise Linux 8 | firefox | Affected | ||
| Red Hat Enterprise Linux 8 | lua-expat | Not affected | ||
| Red Hat Enterprise Linux 8 | mingw-expat | Affected | ||
| Red Hat Enterprise Linux 8 | thunderbird | Affected | ||
| Red Hat Enterprise Linux 9 | firefox | Affected |
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Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.
A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.
A stack overflow vulnerability exists in the libexpat library due to t ...
EPSS
7.5 High
CVSS3