CVE-2020-10029 : Exploit Details and Defense Strategies

CVE-2020-10029 is a vulnerability in the GNU C Library (glibc) that could lead to a buffer overflow under specific conditions. Learn about the impact, technical details, and mitigation steps associated with this CVE.

Understanding CVE-2020-10029

What is CVE-2020-10029?

The vulnerability in the GNU C Library (glibc) before version 2.32 could result in a buffer overflow during range reduction when certain non-canonical bit patterns are present in the input to an 80-bit long double function, such as sinl on x86 targets.

The Impact of CVE-2020-10029

The vulnerability could be exploited to trigger a buffer overflow, potentially leading to arbitrary code execution or denial of service.

Technical Details of CVE-2020-10029

Vulnerability Description

The issue arises in sysdeps/ieee754/ldbl-96/e_rem_pio2l.c within glibc and is specifically related to overflowing an on-stack buffer during range reduction.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Affected Versions: All versions before glibc 2.32

Exploitation Mechanism

The vulnerability can be triggered by passing a specific non-canonical bit pattern, such as 0x5d414141414141410000, to the sinl function on x86 targets.

Mitigation and Prevention

Immediate Steps to Take

Apply patches provided by the respective vendors promptly.
Monitor vendor advisories and security mailing lists for updates.

Long-Term Security Practices

Regularly update glibc and other system libraries to the latest versions.
Implement secure coding practices to prevent buffer overflows and other memory-related vulnerabilities.

Patching and Updates

Refer to vendor-specific advisories and apply recommended patches to mitigate the vulnerability effectively.