### Security Bulletin

## Summary

There is a vulnerability in the gencore user command that affects AIX.

## Vulnerability Details

**CVEID:**CVE-2020-4887

**DESCRIPTION:**IBM AIX could allow a local user to exploit a vulnerability in the gencore user command to create arbitrary files in any directory.

CVSS Base score: 6.2

CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/190911 for the current score.

CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

## Affected Products and Versions

Affected Product(s) | Version(s) |

AIX | 7.1 |

AIX | 7.2 |

VIOS | 3.1 |

Fileset | Lower Level | Upper Level |

bos.mp64 | 7.1.5.0 | 7.1.5.40 |

bos.mp64 | 7.2.3.0 | 7.2.3.19 |

bos.mp64 | 7.2.4.0 | 7.2.4.7 |

bos.mp64 | 7.2.5.0 | 7.2.5.1 |

## Remediation/Fixes

**A. APARS**

IBM has assigned the following APARs to this problem:

AIX Level | APAR | SP |

7.1.5 | IJ28825 | SP08 |

7.2.3 | IJ28826 | SP07 |

7.2.4 | IJ28827 | SP04 |

7.2.5 | IJ28828 | SP02 |

VIOS Level | APAR | SP |

3.1.0 | IJ28826 | 3.1.0.60 |

3.1.1 | IJ28827 | 3.1.1.40 |

3.1.2 | IJ28828 | 3.1.2.20 |

**B. FIXES**

AIX Level | Interim Fix (*.Z) |

7.1.5.5 | IJ28825m5a.201221.epkg.Z |

7.1.5.5 | IJ28825m5b.201221.epkg.Z |

7.1.5.6 | IJ28825m6a.201221.epkg.Z |

7.1.5.6 | IJ28825m6b.201221.epkg.Z |

7.1.5.6 | IJ28825m6c.201221.epkg.Z |

7.1.5.7 | IJ28825m7a.201221.epkg.Z |

7.1.5.7 | IJ28825m7b.201221.epkg.Z |

7.2.3.3 | IJ28826m3a.201221.epkg.Z |

7.2.3.4 | IJ28826m4a.201221.epkg.Z |

7.2.3.5 | IJ28826m5a.201221.epkg.Z |

7.2.4.0 | IJ28827m0a.201222.epkg.Z |

7.2.4.1 | IJ28827m1a.201222.epkg.Z |

7.2.4.2 | IJ28827m2a.201222.epkg.Z |

7.2.4.2 | IJ28827m2b.201222.epkg.Z |

7.2.4.2 | IJ28827m2c.201222.epkg.Z |

7.2.4.3 | IJ28827m3a.210306.epkg.Z |

7.2.5.0 | IJ28828m1a.201222.epkg.Z |

7.2.5.1 | IJ28828m1a.201222.epkg.Z |

VIOS Level | Interim Fix (*.Z) |

3.1.0.20 | IJ28826m3a.201221.epkg.Z |

3.1.0.30 | IJ28826m4a.201221.epkg.Z |

3.1.0.40 | IJ28826m5a.201221.epkg.Z |

3.1.1.0 | IJ28827m0a.201222.epkg.Z |

3.1.1.10 | IJ28827m1b.201222.epkg.Z |

3.1.1.20 | IJ28827m2c.201222.epkg.Z |

3.1.1.21 | IJ28827m2b.201222.epkg.Z |

3.1.1.25 | IJ28827m2a.201222.epkg.Z |

3.1.1.30 | IJ28827m3a.210306.epkg.Z |

3.1.2.0 | IJ28828m1a.201222.epkg.Z |

3.1.2.10 | IJ28828m1a.201222.epkg.Z |

openssl dgst -sha256 | filename |

6d8482ef0decc18eb9cb37820ba1b8099cdf158523b6a95006cee1a081a48f83 | IJ28825m5a.201221.epkg.Z |

343e07de2e256b5439851da18ba3ea3a21dca3a98b55cba09306d46145c952de | IJ28825m5b.201221.epkg.Z |

71c903ff543d5c583d74330a48fdd60ab52d82ff8214407237ca9b8929d38d27 | IJ28825m6a.201221.epkg.Z |

e2798e2d78872870e153fad899b7f9b4c0eb0447b1068211050a91230989aa71 | IJ28825m6b.201221.epkg.Z |

3ac89e2e382cba3c440f37789f437a48be61f2bebcdf398e0a97ab2fa5dd20f7 | IJ28825m6c.201221.epkg.Z |

6bd374a44b0d571ce6628afb0ea163df493f942ddd618a616be24fa1839d7845 | IJ28825m7a.201221.epkg.Z |

0bce6ede7a2ea902d614eb892af533d90b4dfedf3a1d05f17b7ec1c21782fc38 | IJ28825m7b.201221.epkg.Z |

ec4f01c8bc31b61f9679be6d03d3ed7ac9713a4349b31c855eaf4b0f4b9cf377 | IJ28826m3a.201221.epkg.Z |

a3dae1d428ea866a7dab943285a4ebef8fa420451bd23bfeba919761fb4cd300 | IJ28826m4a.201221.epkg.Z |

8c6bb8caf628078c0387433ff978067280477d0b3ea3568102096cbf005a633c | IJ28826m5a.201221.epkg.Z |

5c9ad296cecb576dcef4631b75fa1987a9c856de07e466a5e1a6aa8529b7269f | IJ28827m0a.201222.epkg.Z |

8911ccd41e8926d247de9abc9da7387c1158a4b7606a945b2659dfaa95a6c8f6 | IJ28827m1a.201222.epkg.Z |

e6b977bef6e2d799b5b0ad0fd0a03c3b59922ee0a76ccaf414db97ca879e1329 | IJ28827m1b.201222.epkg.Z |

0637ffbb60a918da32548c3861fbfa381db04be375cf21d372efdef3711ca569 | IJ28827m2a.201222.epkg.Z |

50786a721811b2eff98fbb24c85ed9bb8977f44891d29114d8fe43d79c0fe10e | IJ28827m2b.201222.epkg.Z |

4c6b71538dedded55aeffe7451a02998885dcc80ca12b1fa7937d53ff1a26402 | IJ28827m2c.201222.epkg.Z |

321cd8cf7362d25c05948b0717029e54bcc7233002a5eaae1b30d5e88d5b5f13 | IJ28827m3a.210306.epkg.Z |

d8e107386c7eb45966ef9f3635f4e7253665c04795427f06a7e73a55b8847a54 | IJ28828m1a.201222.epkg.Z |

**C. FIX AND INTERIM FIX INSTALLATION**

## Workarounds and Mitigations

## Get Notified about Future Security Bulletins

### References

## Change History

19 Jan 2021: Initial Publication

30 March 2021: iFix now provided for AIX 7200-04-03 and VIOS 3.1.1.30

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

## Disclaimer

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

## Document Location

Worldwide

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### Document Information

**Modified date:**

30 March 2021

## UID

ibm16406022