^{CVE-2021-31239:}SQLite3 v.3.35.4 contains a buffer over-read vulnerability in the appendvfs.c function that can lead to denial of service attacks.

Overview

SQLite is a widely used embedded SQL database engine that is incorporated into many applications and systems. The vulnerability in version 3.35.4 is related to improper bounds checking in the appendvfs.c component, which handles certain virtual file system operations. When processing specific inputs, the function may attempt to read data beyond the allocated buffer boundaries, resulting in a buffer over-read condition. This can lead to application crashes, information leaks, or other unexpected behavior. The vulnerability has been assigned CWE-125 (Out-of-bounds Read) classification, indicating that it involves reading data past the end of the intended buffer.

Remediation

To mitigate this vulnerability, users should update to a patched version of SQLite that addresses the buffer over-read issue in appendvfs.c. The SQLite development team has acknowledged and fixed this vulnerability. System administrators and developers should:

1. Upgrade SQLite to a version that includes the security fix
2. Apply vendor-specific patches if available from your distribution
3. If immediate updates are not possible, consider implementing application-level controls to limit exposure to potentially malicious inputs
4. Monitor for unusual crashes or behavior in applications using SQLite
5. Review the official SQLite forum post (https://www.sqlite.org/forum/forumpost/d9fce1a89b) for additional mitigation guidance

References

1. SQLite CVE information page: https://www.sqlite.org/cves.html
2. Vulnerability details and patch: https://github.com/Tsiming/Vulnerabilities/blob/main/SQLite/CVE-2021-31239
3. SQLite forum post with mitigation information: https://www.sqlite.org/forum/forumpost/d9fce1a89b
4. Fedora security advisory: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/73XUIHJ6UT75VFPDPLJOXJON7MVIKVZI/
5. Fedora security advisory: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FXFL4TDAH72PRCPD5UPZMJMKIMVOPLTI/
6. Gentoo Linux security advisory: https://security.gentoo.org/glsa/202311-03
7. NetApp security advisory: https://security.netapp.com/advisory/ntap-20230609-0010/