zsh before 5.0.7 allows evaluation of the initial values of integer variables imported from the environment (instead of treating them as literal numbers). That could allow local privilege escalation, under some specific and atypical conditions where zsh is being invoked in privilege-elevation contexts when the environment has not been properly sanitized, such as when zsh is invoked by sudo on systems where "env_reset" has been disabled.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2014-10070 from the MITRE CVE dictionary dictionary and NIST NVD.
Red Hat Product Security has rated this issue as having security impact of Low. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 0 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:N |
| Attack Vector | Local |
| Attack Complexity | High |
| Privileges Required | Low |
| User Interaction | Required |
| Scope | Changed |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | None |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | zsh | Will not fix |
| Red Hat Enterprise Linux 6 | zsh | Will not fix |
| Red Hat Enterprise Linux 5 | zsh | Will not fix |
Don't allow environment variables 'OPTIND' and 'TRY_BLOCK_ERROR' to be inherited by shells called through zsh.
Mitigated by default on Red Hat Enterprise Linux versions 5, 6 and 7, since this is the default configuration on those versions.
Vulmon