Title: Digital Unix MSGCHK MH_PROFILE Symbolic Link Vulnerability
Severity: MODERATE
Description:
The msgchk utility included with certain versions of Digital Unix contains an information disclosure vulnerability which could yield root privilege.
msgchk fails to check file permissions before opening user configuration files in the user's home directory. As a result, the user may create a symbolic link between the .mh_profile configuration file and a target file. Because root privilege is maintained on reading the config file, and symbolic links are followed, a local user is able to read the first line of data contained in any target file readable by the msgchk user. Since msgchk runs setuid root in some implementations, this allows limited information to be read from any file on the host.
Affected Products:
- Digital (Compaq) TRU64/DIGITAL UNIX 4.0.0 D
- Digital (Compaq) TRU64/DIGITAL UNIX 4.0.0 e
- Digital (Compaq) TRU64/DIGITAL UNIX 4.0.0 f
- Digital (Compaq) TRU64/DIGITAL UNIX 4.0.0 g
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