libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.3epss 0.7%
exploitation probability
0.7%top 50% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client.
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Affected products
libssh2 · libssh2public PoCs found — 1
cve_referencegithub.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-pocunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.