smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.9, 5.10, 6.6.160, 6.12.114, 6.18.57, and 1 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr() cifs_posix_to_fattr() ignores the return value of posix_info_parse(). When a malformed POSIX directory entry is encountered (e.g. invalid SID lengths from an untrusted server), posix_info_parse() returns -1 without populating the 'parsed' struct. The uninitialized stack memory in parsed.owner and parsed.group is then passed to sid_to_id(), which processes the garbage bytes and passes them to request_key() to construct a SID string, potentially leaking kernel stack contents to the userspace idmap daemon. Fix this by checking the return value and skipping the SID-to-id mapping when parsing fails. The remaining fattr fields (timestamps, mode, etc.) are populated directly from the 'info' pointer so they are unaffected.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 9934430e2178d5164eb1ac91a9b092f9e7e64745 · fixed in 604feb3e8141bf11f5afd48d36d401fee5af9536; From 9934430e2178d5164eb1ac91a9b092f9e7e64745 · fixed in 33106019c3be57b5fc6411cfaad6d98214a51265; From 9934430e2178d5164eb1ac91a9b092f9e7e64745 · fixed in 2be31f252ade791b84f7164991f14436aed1d4b9; From 9934430e2178d5164eb1ac91a9b092f9e7e64745 · fixed in c9a8b60ce140a68d172452f418137fc7ddbae7db; From 9934430e2178d5164eb1ac91a9b092f9e7e64745 · fixed in da6e25842431982d5a53cf00d925b98c690f4467; From 5.8.17 · fixed in 5.9; From 5.9.2 · fixed in 5.10
- Linux Linux
5.10
- KernelLinux
From 5.10.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.114; From 6.13.0 · fixed in 6.18.57; From 6.19.0 · fixed in 7.2.7