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HistoryOct 03, 2023 - 5:26 p.m.

[SECURITY] [DSA 5514-1] glibc security update

2023-10-0317:26:13
lists.debian.org
25
cve-2023-4911
glibc
qualys research labs
dynamic loader
buffer overflow
debian
privilege escalation
security update

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.016

Percentile

87.4%


Debian Security Advisory DSA-5514-1 [email protected]
https://www.debian.org/security/ Salvatore Bonaccorso
October 03, 2023 https://www.debian.org/security/faq


Package : glibc
CVE ID : CVE-2023-4911

The Qualys Research Labs discovered a buffer overflow in the dynamic
loader's processing of the GLIBC_TUNABLES environment variable. An
attacker can exploit this flaw for privilege escalation.

Details can be found in the Qualys advisory at
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt

For the oldstable distribution (bullseye), this problem has been fixed
in version 2.31-13+deb11u7.

For the stable distribution (bookworm), this problem has been fixed in
version 2.36-9+deb12u3. This update includes fixes for CVE-2023-4527 and
CVE-2023-4806 originally planned for the upcoming bookworm point
release.

We recommend that you upgrade your glibc packages.

For the detailed security status of glibc please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/glibc

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: [email protected]

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.016

Percentile

87.4%