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PuTTY / WinSCP security vulnerabilities
updated since 05.08.2013
Published:14.08.2013
Source:
SecurityVulns ID:13233
Type:client
Threat Level:
7/10
Description:SSH handshake heap buffer overflow, protection bypass, information leakage.
Affected:PUTTY : PuTTY 0.62
 WINSCP : WinSCP 5.1
CVE:CVE-2013-4852 (Integer overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products that use PuTTY allows remote SSH servers to cause a denial of service (crash) and possibly execute arbitrary code in certain applications that use PuTTY via a negative size value in an RSA key signature during the SSH handshake, which triggers a heap-based buffer overflow.)
 CVE-2013-4208 (The rsa_verify function in PuTTY before 0.63 (1) does not clear sensitive process memory after use and (2) does not free certain structures containing sensitive process memory, which might allow local users to discover private RSA and DSA keys.)
 CVE-2013-4207 (Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) via an invalid DSA signature that is not properly handled during computation of a modular inverse and triggers the overflow during a division by zero by the bignum functionality, a different vulnerability than CVE-2013-4206.)
 CVE-2013-4206 (Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) and possibly trigger memory corruption or code execution via a crafted DSA signature, which is not properly handled when performing certain bit-shifting operations during modular multiplication.)
Original documentdocumentDEBIAN, [SECURITY] [DSA 2736-1] putty security update (14.08.2013)
 documentGergely Eberhardt, PuTTY SSH handshake heap overflow (05.08.2013)

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