sunrpc: fix handling of server side tls alerts
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.6.102, 6.12.42, 6.15.10, 6.16.1
- 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
- Exploitation: none
- Automatable: yes
- Technical impact: total
Summary
In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix handling of server side tls alerts Scott Mayhew discovered a security exploit in NFS over TLS in tls_alert_recv() due to its assumption it can read data from the msg iterator's kvec.. kTLS implementation splits TLS non-data record payload between the control message buffer (which includes the type such as TLS aler or TLS cipher change) and the rest of the payload (say TLS alert's level/description) which goes into the msg payload buffer. This patch proposes to rework how control messages are setup and used by sock_recvmsg(). If no control message structure is setup, kTLS layer will read and process TLS data record types. As soon as it encounters a TLS control message, it would return an error. At that point, NFS can setup a kvec backed msg buffer and read in the control message such as a TLS alert. Msg iterator can advance the kvec pointer as a part of the copy process thus we need to revert the iterator before calling into the tls_alert_recv.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 5e052dda121e2870dd87181783da4a95d7d2927b · fixed in b1df394621710b312f0393e3f240fdac0764f968; From 5e052dda121e2870dd87181783da4a95d7d2927b · fixed in 25bb3647d30a20486b5fe7cff2b0e503c16c9692; From 5e052dda121e2870dd87181783da4a95d7d2927b · fixed in 3b549da875414989f480b66835d514be80a0bd9c; From 5e052dda121e2870dd87181783da4a95d7d2927b · fixed in 6b33c31cc788073bfbed9297e1f4486ed73d87da; From 5e052dda121e2870dd87181783da4a95d7d2927b · fixed in bee47cb026e762841f3faece47b51f985e215edb
- Linux Linux
6.4
- KernelLinux
From 6.4.0 · fixed in 6.6.102; From 6.7.0 · fixed in 6.12.42; From 6.13.0 · fixed in 6.15.10; From 6.16.0 · fixed in 6.16.1