CVE-2021-45931 Explained : Impact and Mitigation
Learn about CVE-2021-45931, an out-of-bounds write vulnerability in HarfBuzz 2.9.0, impacting all versions. Find mitigation steps and necessary actions to secure your systems.
HarfBuzz 2.9.0 has an out-of-bounds write vulnerability that affects certain versions.
Understanding CVE-2021-45931
HarfBuzz 2.9.0 is susceptible to an out-of-bounds write vulnerability in certain functions.
What is CVE-2021-45931?
The vulnerability arises in hb_bit_set_invertible_t::set, which is called from hb_sparseset_t<hb_bit_set_invertible_t>::set and hb_set_copy functions in HarfBuzz 2.9.0.
The Impact of CVE-2021-45931
The vulnerability allows for potential out-of-bounds write, which could lead to a security breach or system compromise.
Technical Details of CVE-2021-45931
HarfBuzz 2.9.0 is affected by a critical vulnerability with the following technical details:
Vulnerability Description
An out-of-bounds write vulnerability exists in HarfBuzz 2.9.0's hb_bit_set_invertible_t::set function.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: All versions of HarfBuzz 2.9.0
Exploitation Mechanism
The vulnerability can be exploited through crafted input, potentially leading to unauthorized access or code execution.
Mitigation and Prevention
Immediate action is necessary to secure systems against CVE-2021-45931.
Immediate Steps to Take
- Update HarfBuzz to a patched version.
- Monitor security advisories for any emerging information.
- Implement strict input validation to prevent exploitation.
Long-Term Security Practices
- Regularly update software to the latest secure versions.
- Conduct security audits and vulnerability assessments periodically.
Patching and Updates
- Apply patches provided by the vendor promptly to address the vulnerability.