MGASA-2021-0287

Description

Updated samba and ldb packages fix security vulnerabilities A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability (CVE-2020-27840). A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity (CVE-2021-20254). A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability (CVE-2021-20277). Also, the samba package for Mageia 7 fixes a scriplet issue when updating. Additionally, the sssd package has been rebuilt for the updated ldb package.

Affected Systems

• mageia•ldb

  < 1.5.8-1.1.mga7

• mageia•samba

  < 4.10.18-1.3.mga7

• mageia•sssd

  < 1.16.3-3.3.mga7

• mageia•ldb

  < 2.1.5-1.mga8

• mageia•samba

  < 4.12.15-1.mga8

• mageia•sssd

  < 2.4.0-1.1.mga8

References (6)

• https://advisories.mageia.org/MGASA-2021-0287.html
• https://bugs.mageia.org/show_bug.cgi?id=28686
• https://bugs.mageia.org/show_bug.cgi?id=28042
• https://www.samba.org/samba/security/CVE-2020-27840.html
• https://www.samba.org/samba/security/CVE-2021-20277.html
• https://www.samba.org/samba/security/CVE-2021-20254.html