The Korn shell (aka mksh) before R33d on MirOS (aka MirBSD) does not flush the ttys I/O when invoking mksh in a new terminal, which allows local users to gain privileges by opening a virtual terminal and entering command sequences, which might later be executed in opportunistic circumstances by a different user who launches mksh and specifies that terminal with the -T option.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Miros | Mirbsd | * | 33 (including) |
| Miros | Mirbsd | 33-a (including) | 33-a (including) |
| Miros | Mirbsd | 33-b (including) | 33-b (including) |
| Mksh | Ubuntu | dapper | * |
| Mksh | Ubuntu | feisty | * |
| Mksh | Ubuntu | gutsy | * |
| Mksh | Ubuntu | hardy | * |
| Mksh | Ubuntu | upstream | * |
References
- http://secunia.com/advisories/29803
- http://www.mirbsd.org/mksh.htm#clog
- http://www.osvdb.org/44365
- http://www.securityfocus.com/bid/28768
- https://exchange.xforce.ibmcloud.com/vulnerabilities/41794
- http://secunia.com/advisories/29803
- http://www.mirbsd.org/mksh.htm#clog
- http://www.osvdb.org/44365
- http://www.securityfocus.com/bid/28768
- https://exchange.xforce.ibmcloud.com/vulnerabilities/41794