CVE-2023-38545

Siemens ProductCERT Advisory SSA-082556

Description

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that host name can be is 255 bytes. If the host name is detected to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due to this bug, the local variable that means "let the host resolve the name" could get the wrong value during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target buffer instead of copying just the resolved address there. The target buffer being a heap based buffer, and the host name coming from the URL that curl has been told to operate with.

Metrics

Severity
none
no public PoC known
99.6 %
Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
78.5 %
High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
Published
2021-09-26 00:00 UTC

Affected operating systems

  • bsd

    freebsd / freebsd13.2

  • bsd

    freebsd / freebsd13.3

  • bsd

    freebsd / freebsd14.0

  • bsd

    freebsd / freebsd14.1

  • bsd

    netbsd / netbsd

  • linux

    almalinux / almalinux9.0

  • linux

    amazon / amazon_linux2023.0

  • linux

    amazon / amazon_linux

  • linux

    ubuntu / awsbionic

  • linux

    ubuntu / awsjammy

  • linux

    ubuntu / awsnoble

  • linux

    ubuntu / awsresolute

  • linux

    ubuntu / awsxenial

  • linux

    ubuntu / aws-6.8jammy

  • linux

    ubuntu / aws-hwexenial

  • linux

    ubuntu / azurejammy

  • linux

    ubuntu / azurenoble

  • linux

    ubuntu / azureresolute

  • linux

    ubuntu / azurexenial

  • linux

    ubuntu / azure-4.15bionic

  • linux

    suse / basesystem_module15

  • linux

    debian / debian_linux10.0

  • linux

    debian / debian_linux11.0

  • linux

    debian / debian_linux12.0

Affected products

Products and version ranges extracted from the vendor/CERT advisory. A range like „<4.14.6“ implies the update recommendation „upgrade to 4.14.6 or later“.

  • android

    :linux_kernel::0

  • android

    :linux_kernel:Kernel

  • arista

    cloudvision_agni2024.4.0 – 2025.2.2

  • arista

    cloudvision_portal2024.2.0 – 2026.1.0

  • arista

    velocloud_edge4.5.0 – 6.4.1

  • arista

    velocloud_gateway

  • arista

    velocloud_orchestrator

  • bitnami

    java-min1.9.0

  • bitnami

    varnish6.1.0

  • bitnami

    varnish7.4.0

  • Dell

    ECS3.8.1.0-3.8.1.7

  • Dell

    NetWorkervProxy 19.14

  • Dell

    PowerScale OneFSNode Firmware Package 14.1

  • Dell

    Secure Connect GatewayAppliance 5.32.00.18

  • Dell

    Secure Connect Gateway< 5.36.00.16

    fixed in 5.36.00.16

  • Dell

    Secure Connect GatewayAppliance <5.32.00.18

  • gnu

    glibc2.35 – 2.37

  • gnu

    glibc

  • gnupg

    libgcrypt1.11.0 – 1.11.3

  • gnupg

    libgcrypt1.12.0 – 1.12.2

  • gnupg

    libgcrypt1.8.8 – 1.10.4

  • hackage

    xz-clib5.6.3

  • hackage

    xz-clib5.6.4

  • hackage

    xz-clib5.8.0

References & sources

Linked CVEs

Show 291 more CVEs
IDCVE-2023-38545