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Chris Dunlap <chris.m.dunlap () gmail com> writes: A buffer overflow vulnerability in MUNGE allows a local attacker to leak cryptographic key material from the munged daemon process memory. With the leaked key material, the attacker could forge arbitrary MUNGE credentials to impersonate any user to services that rely on MUNGE for authentication. Thanks for posting this to oss-security. [...]
There is no indication this vulnerability is being exploited in the wild. The vulnerability was discovered during a security audit and responsibly disclosed.
[...] I see there's a writeup published now as well: https://blog.lexfo.fr/munge-heap-buffer-overflow.html Reported by Titouan Lazard (LEXFO). sam
MUNGE is an authentication service for creating and validating user credentials. From 0.5 to 0.5.17, local attacker can exploit a buffer overflow vulnerability in munged (the MUNGE authentication daemon) to leak cryptographic key material from process memory. With the leaked key material, the attacker could forge arbitrary MUNGE credentials to impersonate any user (including root) to services that rely on MUNGE for authentication. The vulnerability allows a buffer overflow by sending a crafted message with an oversized address length field, corrupting munged's internal state and enabling extraction of the MAC subkey used for credential verification. This vulnerability is fixed in 0.5.18.
MUNGE is an authentication service for creating and validating user credentials. From 0.5 to 0.5.17, local attacker can exploit a buffer overflow vulnerability in munged (the MUNGE authentication daemon) to leak cryptographic key material from process memory. With the leaked key material, the attacker could forge arbitrary MUNGE credentials to impersonate any user (including root) to services that rely on MUNGE for authentication. The vulnerability allows a buffer overflow by sending a crafted message with an oversized address length field, corrupting munged's internal state and enabling extraction of the MAC subkey used for credential verification. This vulnerability is fixed in 0.5.18.