QID 354757

Date Published: 2023-02-28

QID 354757: Amazon Linux Security Advisory for glibc : ALAS2-2023-1944

A vulnerability was discovered in glibc where the ld_prefer_map_32bit_exec environment variable is not ignored when running binaries with the setuid flag on x86_64 architectures.
This allows an attacker to force system to utilize only half of the memory (making the system think the software is 32-bit only), thus lowering the amount of memory being used with address space layout randomization (aslr).
The highest threat is confidentiality although the complexity of attack is high.
The affected application must already have other vulnerabilities for this flaw to be usable. (
( CVE-2019-19126) a flaw was found in glibc in versions prior to 2.32.
Pseudo-zero values are not validated causing a stack corruption due to a stack-based overflow.
The highest threat from this vulnerability is to system availability. (
( CVE-2020-10029) a use-after-free vulnerability was found in glibc in the way the tilde expansion was carried out.
Directory paths containing an initial tilde followed by a valid username were affected by this issue.
A local attacker could exploit this flaw by creating a specially crafted path that, when processed by the glob function, would potentially lead to arbitrary code execution. (
( CVE-2020-1752)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7 severity.
  • CVSS V2 rated as Medium - 3.7 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2023-1944 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 354757

    CVE-2020-10029 | CVE-2019-19126 | CVE-2020-1752 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2023-1944 amazon linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2023-1944.html
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